I need to get every four digit combination as part of the next challenge in bandit. I'm not a programmer so I googled for a solution. Please, how do I run this program?

int main(int argc, char** argv){
int a,b,c,d;

for(a=1; a<5; a++){
for(b=1; b<5; b++){
for(c=1; c<5; c++){
for(d=1; d<5; d++){
if(!(a==b || a==c || a==d || b==c || b==d || c==d))
printf("%d%d%d%d
",a,b,c,d);
}
}
}
}

return 0;
}

:-)~MIKE~(-: