To Count Number Of Occurrences Of A Characters/Letters Sequence In A String

Here C program to count the number of  occurrences of a  characters/letters sequence  in a string.This c program use ASCII value of small letter for looping and checking .

Example :

• String : hello 
• "h" found 1 time
• "e" found 1 time 
• " l" found 2 time
• "o" found 1 time

Program :

#include<stdio.h>
#include<conio.h>
#include<string.h>
void main()
{
char ch;
do{
    char a[20],f=0;
    int i,n,ascii;
    clrscr();
printf("enter a string:");
     gets(a);
     strlwr(a); // Sting convert in small letter 

        for(ascii=97;ascii<=122;ascii++)// a=97 and z=122 ascii value for looping 
        {
        n=0;
        f=0;
        for(i=0;a[i]!=NULL;i++)
        {
        
            if(ascii==a[i])// Ascii value for checking
            {    
                n++; // If Checking sucessfull ..increment +1
                f=1; 
            }
        }
        if(f==1) // Checking f value is similar or not 
            printf("\t\t%c value found %d times ",ascii,n); 
        }
        printf("\n\t continue (y/n):");
        ch=getch();
}while(ch=='y'||ch=='Y');

}

Output :

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