Java to C – strings

I have to "convert" java to c. Did I do it right? Can you correct

public static void main(String[] args) {
    String s = args[0];
    String t = args[1];
    String st = s + t;
} 

Java -> C

int main() {

    char *s = args[0];
    char *t = args[1];

    char *st = (char*) calloc(1, strlen(s) + strlen(t) + 1); // '\0' nicht vergessen!

    strcat(st, s);
    strcat(st, t);

    free(st);
}

>Solution :

• You will need arguments for the main function.
• The first argument in C will corresponds to the executable itself. Therefore, you should start working with second argument.
• Casting results of malloc() family is considered as a bad practice.
• You can use malloc() and strcpy() to save initialization.
• It will be safer to check for preconditions in C because it won’t check for them and safely throw exceptions like Java.

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

int main(int argc, char* args[]) {

    if (argc < 3) return 1; // check if there are enough arguments
    char *s = args[1];
    char *t = args[2];

    char *st = malloc(strlen(s) + strlen(t) + 1); // '\0' nicht vergessen!
    if (st == NULL) return 1; // check if allocation succeeded

    strcpy(st, s);
    strcat(st, t);

    free(st);
}