for循环
#include <stdio.h>
int main() {
char a;
scanf("%c",&a);
for(int i=1;i<4;i++)
{
int count=2*i-1;
int space=3-i;
for (int k=1;k<=space;k++)
{
printf(" ");
}
for (int j=1;j<=count;j++)
{
printf("%c",a);
}
printf("\n");
}
for(int i=2;i>0;i--)
{
int count=2*i-1;
int space=3-i;
for (int k=1;k<=space;k++)
{
printf(" ");
}
for (int j=1;j<=count;j++)
{
printf("%c",a);
}
printf("\n");
}
return 0;
}