pyramid in C

-----------------------pyramid1.c-----------------------
#include <stdio.h>
#include <stdlib.h>

int main(int argc, char*argv[])
{
    int i, j, level;
    char ch = '*';

    if(argc < 2)
    {
        printf("usage: %s <level> <<character>>\n", argv[0]);
        exit(0);
    }
    level = atoi(argv[1]);
    if(argv[2]) ch = argv[2][0];

    for(i=0; i<level; i++)
    {
        for(j=i; j<level-1; j++)
            printf("  ");

        for(j=0; j<2*i+1; j++)
            printf("%c ", ch);

        printf("\n");
    }

    return 0;
}
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-----------------------pyramid2.c-----------------------
#include <stdio.h>
#include <stdlib.h>

int main(int argc, char*argv[])
{
    int i, j, level;
    char ch = '*';

    if(argc < 2)
    {
        printf("usage: %s <level> <<character>>\n", argv[0]);
        exit(0);
    }
    level = atoi(argv[1]);
    if(argv[2]) ch = argv[2][0];

    for(i=0; i<level; i++)
    {
        for(j=0; j<2*level-1; j++)
            printf("%c ", (abs(level-1-j)<=i)?ch:' ');

        printf("\n");
    }

    return 0;
}
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