Question

How to implement the strcat function in C

Answer 1

#include <stdio.h>

char* strcat(char* s1, const char* s2) {
	char* p;

	// point to end of s1
	for (p = s1; *p != '\0'; p++)
		;
	//  copy s2 to end of s1
	for (; (*p = *s2) != '\0'; p++, s2++)
		;
	return s1;
}

int main()
{
	char str1[64] = "c programming";
	char str2[32] = " language";

	strcat(str1, str2);

	puts(str1);

	return 0;
}




/*
run:
         
c programming language
      
*/

 

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