中空的菱形

#include <stdio.h>void main(){int i,j,k;for (i=1; i<=4; i++){for (j=3;j>=i;j--)printf(" ");printf("*");for (k=1; k<=(i-1)*2-1; k++)printf(" ");if (i != 1) printf("*");printf("/n");}for (i=3; i>=1; i--){for (j=3; j>=i; j--)printf(" ");printf("*");for (k=1; k<=(i-1)*2-1; k++)printf(" "); if (i != 1)printf("*");printf("/n");}}