[virxen]

this will give you the opposite from what you want in 1)
do the rest by yourself

(hint:you must add 1 char and 1 number in order to work as you want...but where?)

#include <stdio.h>

int main(){
    for (int i=0;i<4;i++){
        printf("\n");
        for (int j=0;j<(i+1);j++)
            printf("%d",(i+j)%2);
    }
getchar();
    return 0;
}

output
---------


0
10
010
1010



with this try and 2)