Program membuat program segitiga bintang

Source code
#include
void main()
{
int n, a, c=0, z, x, y;
printf("-------------------------------\n");
printf(" PROGRAM SEGITIGA BINTANG \n");
printf("-------------------------------\n");

printf("Inputkan jumlah baris : ");
scanf("%d",&n);
puts("");
a=n;
z=n-1;

for(x=1;x<=n;x++) { c=1; for(y=1;y<=a;y++) { if (c<=z) { printf(" "); c=c++; } else { if(y==c||y==a||z==0) printf(" *"); else printf(" "); } } z=z--; a=a++; printf("\n"); } }
Output