1
       121
      12321
     1234321
……………
键盘输入行数。。应该是不大于9的吧
程序怎么写。。

[ 本帖最后由 mey 于 2010-1-11 19:13 编辑 ]

#include<stdio.h>
#include<math.h>
void main()
{int rows;
int i,j;
scanf("%d",&rows);
for(i=1;i<=rows;i++)
  {for(j=1;j<=2*rows-1;j++)
    {if(abs(j-rows)<i)
    printf("%d",i-abs(j-rows));
    else
    printf(" ");
    }
    printf("\n");
   }
  getchar();
  getchar();
}

交互式的程序  再加点prinf提示语句就ok了

abs是啥？还没学到。。能不用这个函数写一下？

# include <stdio.h>
int main (void)
{
    int i,j,n,a[9];
    for(i=0;i<10;i++)
       a[i]=i;
    printf("Enter n(n<=9):");
    scanf("%d",&n);
    for(i=1;i<=n;i++){
        for(j=1;j<=n-i;j++)
            printf(" ");
        for(j=1;j<=i*2-1;j++){
           if(j<=i)
               printf("%d",a[j]);
           else
               printf("%d",a[2*i-j]);
        }
        printf("\n");
    }
}

请教不用数组的做法。。。。

abs就是绝对值呀
在math。h头文件中

只用循环怎么做呢。不用数组

知道的说下

给个简单点的 你 ，
#include<stdio.h>
main()
{
    int a;
    scanf("%d",&a);
    switch(a)
{
    case:1;     printf("1\n");break;
   
    case:2;     printf(" 1\n");
                printf("121\n");break;
        
    case:3;     printf("  1\n");
                printf(" 121\n");
                printf("12321\n");break;
    case:4;     printf("   1\n");
                printf("  121\n");
                printf(" 12321\n");
                printf("1234321\n");break;
    case:5;     printf("    1\n");
                printf("   121\n");
                printf("  12321\n");
                printf(" 1234321\n");
                printf("123454321\n");break;
    case:6;     printf("     1\n");
                printf("    121\n");
                printf("   12321\n");
                printf("  1234321\n");
                printf(" 123454321\n");
                printf("12345654321\n");break;
    case:7;     printf("      1\n");
                printf("     121\n");
                printf("    12321\n");
                printf("   1234321\n");
                printf("  123454321\n");
                printf(" 12345654321\n");
                printf("1234567654321\n");break;
    case:8;     printf("       1\n");
                printf("      121\n");
                printf("     12321\n");
                printf("    1234321\n");
                printf("   123454321\n");
                printf("  12345654321\n");
                printf(" 1234567654321\n");
                printf("123456787654321\n");break;
    case:9;     printf("        1\n");
                printf("       121\n");
                printf("      12321\n");
                printf("     1234321\n");
                printf("    123454321\n");
                printf("   12345654321\n");
                printf("  1234567654321\n");
                printf(" 123456787654321\n");
                printf("12345678987654321\n");break;
    default:printf("输入1~9的数")
}
}

[ 本帖最后由 z1191387820 于 2010-1-12 18:51 编辑 ]