C - The Reaon Behind Pointer

1. Pure of array
========================

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

int setFirst(char n[]){

    n[0] = 'l';
    n[1] = 'a';
    n[2] = 'd';
    n[3] = 'y';

    return 0;
}

int setSecond(char n[]){
    n[4] = ' ';
    n[5] = 'g';
    n[6] = 'a';
    n[7] = 'g';
    n[8] = 'a';
    n[9] = '\0';

    return 0;
}

int main(int c){

    system("color 5f");

    char name[10];

    setFirst(name);
    setSecond(name);

    printf("%s",name);

    return 0;
}




2. Using pointer and dma
==============================
#include <stdio.h>
#include <stdlib.h>

int setFirst(char n[]){

    n[0] = 'l';
    n[1] = 'a';
    n[2] = 'd';
    n[3] = 'y';

    return 0;
}

int setSecond(char n[]){

    n[4] = ' ';
    n[5] = 'g';
    n[6] = 'a';
    n[7] = 'g';
    n[8] = 'a';
    n[9] = '\0';

    return 0;
}

int main(int c){

    system("color 5f");

    char* name;
    name = (char *)malloc(1*sizeof(char));

    setFirst(name);
    setSecond(name);

    printf("%s",name);

    return 0;
}



3. argument pointer
=======================
#include <stdio.h>
#include <stdlib.h>

int setFirst(char *n){

    n[0] = 'l';
    n[1] = 'a';
    n[2] = 'd';
    n[3] = 'y';

    return 0;
}

int setSecond(char n[]){
    n[4] = ' ';
    n[5] = 'g';
    n[6] = 'a';
    n[7] = 'g';
    n[8] = 'a';
    n[9] = '\0';

    return 0;
}

int main(int c){
    system("color 5f");

    char* name;
    name = (char *)malloc(1*sizeof(char));

    setFirst(name);
    setSecond(name);

    printf("%s",name);

    return 0;
}


4. Use strcpy and strcat
========================
#include <stdio.h>
#include <stdlib.h>

int setFirst(char *n){

    const char* name = "lady";
    strcpy(n, name);

    return 0;
}

int setSecond(char n[]){
 
    const char* name = " gaga";
    strcat(n, name);

    return 0;
}

int main(int c){

    system("color 5f");

    char* name;
    name = (char *)malloc(1*sizeof(char));

    setFirst(name);
    setSecond(name);

    printf("%s",name);

    return 0;
}

C - The Reaon Behind Pointer