求解一道C语言题，高手请进入

以下是程序和附图

#include <stdio.h>

int main()
{
int i, j ,k=-1;
for( i = 3; i < 4; i+=k)
{
for ( j = 0; j < 4-i-1; ++j )
printf( " " );
for ( j = 0; j < 2*i+1; ++j )
printf( "＊" );
putchar( '\n' );
if ( i == 0 ) k = 1;
}
}

题目呢

晕， 自己看看书 编吧

#include <stdio.h>

void main() { int i, j, k = -1; for ( i = 4; i < 5; i += k ) { for ( j = 0; j < 4-i; ++j ) printf(" "); for ( j = 0; j < 2*i-1; ++j ) printf("* "); printf("\n"); if ( i == 1 ) { k = 1; } } } 附图: