Write a function, substr_count , that counts the occurrences of the subString “c

Question

Write a function, substr_count, that counts the occurrences of the subString “class” in an input string, srcString.

#include <stdio.h>

#include <string.h> //YOU CAN USE STRING LIBRARY Functions here

// Count the number of occurrences of “class” in srcString

int substr_count(char *srcString, char *subString)

{

//YOUR CODE HERE

}

int main(void)

{

char srcString[200] = ""; //empty string

char subString[8] = "class"; //substring

int get_count = 0;

scanf("%s", srcString); //get a string from input keyboard

get_count = substr_count(srcString, subString);

printf("%s occurs %d times in %s ", subString, get_count, srcString);

}

Explanation / Answer

#include <stdio.h>

#include <string.h>

int substr_count(const char *srcString, const char *subString)

{

int countOccurence = 0 ;

size_t sub_len = strlen(subString) ;

const char *p= srcString ;

while(p= strstr(p,subString))

{

++countOccurence ;

p+=sub_len;

}

return countOccurence;

}

int main(void)

{

char srcString[200]= "" ;

char subString[] = "mystring";

int get_count= 0;

scanf("%199s",srcString); //setting limit

get_count = substr_count(srcString , subString);

printf("%s occurs %d times in %s ", subString, get_count, srcString);

}

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