Question

How to allocate string in C

Answer 1

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

char* alocate_string(char* str, int size) {
    str = (char*)malloc(size * sizeof(char)); 

    if (str == NULL) {
        printf("Memory allocation failed\n");
    }

    return str;
}

int main(void) {

    char* str = NULL;
        
    str = alocate_string(str, 64);

    if (str != NULL) {
        strcpy(str, "c programming");
        printf("%s", str);
        free(str);
    }

    return 0;
}




/*
run:

c programming

*/

 

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Answer 2

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

void alocate_string(char** str, int size) {
    *str = (char*)malloc(size * sizeof(char)); 

    if (str == NULL) {
        printf("Memory allocation failed\n");
    }
}

int main(void) {

    char* str = NULL;
        
    alocate_string(&str, 64);

    if (str != NULL) {
        strcpy(str, "c programming");
        printf("%s", str);
        free(str);
    }

    return 0;
}




/*
run:

c programming

*/

 

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