This program is all about finding how many times a character comes in a string. In the program there is a count variable which will be incremented if the same character appears again and then that count variable will be printed.

  #include <stdio.h>
    int main(){
       char c[1000],char;
       int i,count=0;
       printf("Enter any string ");
       gets(c);
       printf("Enter any character whose frequency u want to find: ");
       scanf("%c",&char);
       for(i=0;c[i]!='\0';++i)
       {                             
            // comparing string with the character whose frequency we want to find.
             if(char==c[i])           
           // increment the count variable if the same character repeated.
               ++count;
       }
       printf("Frequency of %c = %d", char, count);   // printing the frequency of the character.
       return 0;
    }

Output:

Enter a string: Welcome to Findnerd.
Enter a character to find frequency: e
Frequency of e = 3