[1]finding length of a String without using library function strlen

#include <stdio.h>

int main()
{
    
    char str[100],i;
    printf("Enter a string: \n");
    scanf("%s",str);

    // '\0' represents end of String
    for(i=0; str[i]!='\0'; ++i);
       printf("\nLength of input string: %d",i);
    
    return 0;
}

[2]Program to separate the individual characters from a string

#include <stdio.h>

#include <string.h>

int main()

{

char string[] = "characters";

printf("Individual characters from given string:\n");

//Iterate through the string and display individual character

for(int i = 0; i < strlen(string); i++){

printf("%c ", string[i]);

}

return 0;

}

[3]Write a program in C to print individual characters of string in reverse order

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

void main()

{

char str[100]; /* Declares a string of size 100 */

int l,i;

printf("Input the string : ");

fgets(str, sizeof str, stdin);

l=strlen(str);

printf("The characters of the string in reverse are : \n");

for(i=l;i>=0;i--)

{

printf("%c ", str[i]);

}

printf("\n");

}

Program to Count Total Number of Words in a String

#include <stdio.h>
#include <conio.h>
void main()
{
char a[100];
int len,i,word=1;
clrscr();
printf("\nENTER A STRING: ");
gets(a);
len=strlen(a);
for(i=0;i<len;i++)
{
if(a[i]!=' ' && a[i+1]==' ')
word=word+1;
}
printf("\nTHERE ARE %d WORDS IN THE STRING",word);
getch();
}

C Program to Compare Two Strings without using strcmp

#include<stdio.h>
 
int main() {
   char s1[100], s2[100];
   int i;
 
   printf("\nEnter two strings :");
   gets(s1);
   gets(s2);
 
   i = 0;
   // while s1 is equal to s2 
   while (s1[i] == s2[i] && s1[i] != '\0')
      i++;
   if (s1[i] > s2[i])
      printf("s1 is greater than s2");
   else if (s1[i] < s2[i])
      printf("s1 is less than s2");
   else
      printf("s1 is equal to s2");
 
   return 0;
}

Output:

Enter two strings :ac
acde
s1 is less than s2

Program to Count Alphabets Digits Special characters in a string

#include <stdio.h>
 
#define MAX_SIZE 100 //Maximum size of the string
 
 
int main()
{
    char string[MAX_SIZE];
    int alphabets, digits, others, i;
 
    alphabets = digits = others = i = 0;
 
 
    /* Reads a string from user */
    printf("\nEnter any string : ");
    gets(string);
 
    /*
     * Checks each character of string
     */
    while(string[i]!='\0')
    {
        if((string[i]>='a' && string[i]<='z') || (string[i]>='A' && string[i]<='Z'))
        {
            alphabets++;
        }
        else if(string[i]>='0' && string[i]<='9')
        {
            digits++;
        }
        else
        {
            others++;
        }
 
        i++;
    }
 
    printf("\nAlphabets = [ %d ]\n", alphabets);
    printf("\nDigits = [ %d ]\n", digits);
    printf("\nSpecial characters = [ %d ]\n", others);
 
    return 0;
}

OUTPUT : :

C
1
2
3
4
5
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7
8
9
/*  C Program to Count Alphabets Digits Special characters in a string  */
 
Enter any string : Hello www.codezclub.com
 
Alphabets = [ 20 ]
 
Digits = [ 0 ]
 
Special characters = [ 3 ]



 
Copy String Without Using strcpy()#include <stdio.h>
int main() {
    char s1[100], s2[100], i;
    printf("Enter string s1: ");
    fgets(s1, sizeof(s1), stdin);

    for (i = 0; s1[i] != '\0'; ++i) {
        s2[i] = s1[i];
    }

    s2[i] = '\0';
    printf("String s2: %s", s2);
    return 0;
}
Output
Enter string s1: Hey fellow programmer.
String s2: Hey fellow programmer.Write a program in C to count total number of vowel or consonant in a string.#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#define str_size 100 //Declare the maximum size of the string

void main()
{
    char str[str_size];
    int i, len, vowel, cons;
	
       printf("\n\nCount total number of vowel or consonant :\n");
       printf("----------------------------------------------\n"); 	
       printf("Input the string : ");
       fgets(str, sizeof str, stdin);	

    vowel = 0;
    cons = 0;
    len = strlen(str);

    for(i=0; i<len; i++)
    {

        if(str[i] =='a' || str[i]=='e' || str[i]=='i' || str[i]=='o' || str[i]=='u' || str[i]=='A' || str[i]=='E' || str[i]=='I' || str[i]=='O' || str[i]=='U')
        {
            vowel++;
        }
        else if((str[i]>='a' && str[i]<='z') || (str[i]>='A' && str[i]<='Z'))
        {
            cons++;
        }
    }
    printf("\nThe total number of vowel in the string is : %d\n", vowel);
    printf("The total number of consonant in the string is : %d\n\n", cons);
}

Sample Output:
Count total number of vowel or consonant :                                                                    
----------------------------------------------                                                                
Input the string : Welcome to w3resource.com                                                                  
                                                                                                              
The total number of vowel in the string is : 9                                                                
The total number of consonant in the string is : 12 ***********************-------Program to find maximum and minimum occurring character in a string#include <stdio.h>
#include <stdlib.h>

int main()
{
    char str[100];
    int i,j;
    char Maxrepeatedchar[100];
    int count=0;
    int maxcount=0;
    
    printf("Enter a string");
    gets(str);
    
    for(i=0; i<strlen(str); i++){
        count=0;
        for(j=0; i<strlen(str) ;j++){
            if(str[i]==str[j]){
                count++;
            }
            
        }
        if(maxcount<count){
            maxcount=count;
            maxrepeatedchar=str[i];
        }
    }
    
    printf("The char %c has been repeated maximum of %d times",maxrepeatedchar,maxcount);

    return 0;
}
**************************
C Programming: Sort a string array in ascending order#include <stdio.h>
#include <string.h>
void main()
{
  char str[100],ch;
  int i,j,l;
   
       printf("Input the string : ");
       fgets(str, sizeof str, stdin);
  l=strlen(str);
  /* sorting process */
  for(i=1;i<l;i++)
    for(j=0;j<l-i;j++)
	if(str[j]>str[j+1])
	{
	  ch=str[j];
	  str[j] = str[j+1];
	  str[j+1]=ch;
	}
   printf("After sorting the string appears like : \n");
   printf("%s\n\n",str);
  }
**************************************++++++++++++++----------
C Programming: Extract a substring from a given string#include <stdio.h>
void main() 
{
   char str[100], sstr[100];
   int pos, l, c = 0;
        printf("Input the string : ");
       fgets(str, sizeof str, stdin);
 
   printf("Input the position to start extraction :");
   scanf("%d", &pos);
   
   printf("Input the length of substring :");
   scanf("%d", &l);
 
   while (c < l) 
   {
      sstr[c] = str[pos+c-1];
      c++;
   }
   sstr[c] = '\0';
 
   printf("The substring retrieve from the string is : \" %s\ "\n\n", sstr);
 
}
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa****************************************************************

Check whether a given substring is present in the given string

#include<stdio.h>
#include<string.h>

 int main()
 {
     char mainstring[40]="i love you vikram";
     char substring[30]="Pihu";
     char *result;

     result = strstr(mainstring ,substring);

     if(result){
            printf("present");}
     else {
        printf("not Present");
     }

Replace lowercase characters by uppercase and vice-versa#include<stdio.h>
#include<string.h>
 
int main()
{
        char str[20];
        int i;
        printf("\nEnter any string :: ");
        gets(str);
 
        printf("\nThe input String is :: [ %s ]\n",str);
        for(i=0;i<=strlen(str);i++)
    {
                if(str[i]>=97&&str[i]<=122)
                        str[i]=str[i]-32;
                else if(str[i]>=65&&str[i]<=90)
                        str[i]=str[i]+32;
                else;
        }
        printf("\nThe Converted String is :: [ %s ]\n",str);
 
        return 0;
}To count number of times a letter repeated in sentence

#include<stdio.h>
#include<string.h>
main()
{
int i,count=0;
char c,str[100];
printf("Enter a sentence\n");
gets(str);
printf("Enter a character to know it's repetance in sentence\n");
scanf("%c",&c);

for(i=0;i<strlen(str);i++)
{
    if(str[i]==c)
    {
        count++;
    }
}
printf("Letter %c repeated %d times\n",c,count);
}Program to remove all characters in a string except alphabets
#include<stdio.h>
int main()
{
char str[150];
int i, j;
printf(“\nEnter a string : “);
gets(str);
for(i = 0; str[i] != ‘\0’; ++i)
{
while (!( (str[i] >= ‘a’ && str[i] <= ‘z’) || (str[i] >= ‘A’ && str[i] <= ‘Z’) || str[i] == ‘\0’) )
{
for(j = i; str[j] != ‘\0’; ++j)
{
str[j] = str[j+1];
}
str[j] = ‘\0’;
}
}
printf(“\nResultant String : “);
puts(str);
return 0;
}
Find the Frequency of a Character
#include <stdio.h>
int main() {
    char str[1000], ch;
    int count = 0;

    printf("Enter a string: ");
    fgets(str, sizeof(str), stdin);

    printf("Enter a character to find its frequency: ");
    scanf("%c", &ch);

    for (int i = 0; str[i] != '\0'; ++i) {
        if (ch == str[i])
            ++count;
    }

    printf("Frequency of %c = %d", ch, count);
    return 0;
}
Output
Enter a string: This website is awesome.
Enter a character to find its frequency: e
Frequency of e = 4Concatenate Two Strings Manually#include<stdio.h>
void main(void)
{
  char str1[25],str2[25];
  int i=0,j=0;
  printf("\nEnter First String:");
  gets(str1);
  printf("\nEnter Second String:");
  gets(str2);
  while(str1[i]!='\0')
  i++;
  while(str2[j]!='\0')
  {
    str1[i]=str2[j];
    j++;
    i++;
  }
  str1[i]='\0';
  printf("\nConcatenated String is %s",str1);
}Find the largest and smallest word in a string Convert a string to uppercase
#include<stdio.h>
#include<string.h>
int main(){
   char str[25];
   int i;

   printf("Enter the string:");
   scanf("%s",str);

   for(i=0;i<=strlen(str);i++){
      if(str[i]>=97&&str[i]<=122)
         str[i]=str[i]-32;
   }
   printf("\nUpper Case String is: %s",str);
   return 0;
}


Convert a string to lowercase#include<stdio.h>
#include<string.h>
int main(){
   /* This array can hold a string of upto 25
    * chars, if you are going to enter larger string
    * then increase the array size accordingly
    */
   char str[25];
   int i;
   printf("Enter the string: ");
   scanf("%s",str);
 
   for(i=0;i<=strlen(str);i++){
      if(str[i]>=65&&str[i]<=90)
         str[i]=str[i]+32;
   }
   printf("\nLower Case String is: %s",str);
   return 0;
}


Check whether a given character is upper case, lower case, number or special character




#include
int main()
{
//Fill the code
	char ch;
	scanf(“%c”,&ch);
	if(ch >= 65 && ch <= 90)
		printf(“Upper”);
	else if(ch >= 97 && ch <= 122)
		printf(“Lower”);
	else if(ch >= 48 && ch <= 57)
		printf(“Number”);
	else
		printf(“Symbol”);
return 0;
}


  

Program

Wednesday, February 3, 2021

STRING PROGRAM IN C

[1]finding length of a String without using library function strlen

[2]Program to separate the individual characters from a string

Program to Count Total Number of Words in a String

C Program to Compare Two Strings without using strcmp

Program to Count Alphabets Digits Special characters in a string

OUTPUT : :

Copy String Without Using strcpy()

`Write a program in C to count total number of vowel or consonant in a string.`

Program to find maximum and minimum occurring character in a string

C Programming: Sort a string array in ascending order

C Programming: Extract a substring from a given string

Check whether a given substring is present in the given string

Replace lowercase characters by uppercase and vice-versa

Program to remove all characters in a string except alphabets

Find the Frequency of a Character

Concatenate Two Strings Manually

#include<stdio.h>

Find the largest and smallest word in a string

Convert a string to uppercase

Convert a string to lowercase

Check whether a given character is upper case, lower case, number or special character

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