calloc

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

int main (int argc, char **argv){

    int i;

    //calloc - allocate and zero initialize array
    char* buff1 = calloc(10,1);

    if(buff1)
    {

        for(i=0;i<10;i++)
        {
            printf("%02X ",buff1[i]);
        }
        printf("\n");

        buff1[0]='a';
        buff1[1]='b';
        buff1[2]='c';
        buff1[3]='d';
        buff1[4]='e';
        buff1[5]='f';
        buff1[6]='g';
        buff1[7]='h';
        buff1[8]='i';

        for(i=0;i<10;i++)
        {
            printf("%02X ",buff1[i]);
        }
        printf("\n");

        //buff1 zero terminated, buff1[9] is 0
        printf("%s\n",buff1);

        free(buff1);
    }


    int* buff2 = calloc(10,sizeof(int));

    if(buff2)
    {

        for(i=0;i<10;i++)
        {
            printf("%08X ",buff2[i]);
        }
        printf("\n");

        buff2[0]=0x0f0f0f0f;
        buff2[1]=65535;
        buff2[2]=789;

        for(i=0;i<10;i++)
        {
            printf("%08X ",buff2[i]);
        }
        printf("\n");


        free(buff2);
    }

return 0;
}

/*
00 00 00 00 00 00 00 00 00 00
61 62 63 64 65 66 67 68 69 00
abcdefghi
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
0F0F0F0F 0000FFFF 00000315 00000000 00000000 00000000 00000000 00000000 00000000 00000000
 */