Question

How to implement the strcspn function in C

Answer 1

#include <stdio.h>

size_t strcspn_(const char* s1, const char* s2) {
	// find index in s1 of first s2[i] in s1
	const char* p1, * p2;

	for (p1 = s1; *p1 != '\0'; p1++)
		for (p2 = s2; *p2 != '\0'; p2++)
			if (*p1 == *p2) // *p2 = "am" *p1 = "ammin"
				return p1 - s1;
	return p1 - s1;
}

int main() {
	const char str1[32] = "c programming";
	const char str2[32] = "am";

	printf("%zu", strcspn_(str1, str2));

	return 0;
}




/*
run:
    
7
    
*/

 

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