Thread: [HELP] My capitalization program is not working

The problem in my simple learning program is the, basically, it doesn't work and it prints out Segmentation fault (core dumped). I just want to know why it does that and what are the possible solutions.

EDIT: That's not really the main problem. Even if I just assign a value to input, it still prints out the error.

Code:

#include <stdio.h>#include <string.h>


char *cap(char *);


int main(int argc, char *argv[]) {
	char *input = "Hello World!";


	printf("CAPITALIZED: ");
	cap(input);


	return 0;
}


char *cap(char *input) {
	int i, n;


	for(i = 0, n = strlen(input); i < n; i++) {
		if(input[i] >= 'a' && input[i] <= 'z') {
			input[i] -= ('a' - 'A');
			printf("%c", input[i]);
		}
		printf("\n");
	}
}