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#include <stdio.h>
void main()
{
int i,j;
for (i=1;i<=9;i++)
{
for (j=1;j<=i;j++)
printf("%d*%d=%2d ",j,i,j*i);
printf("\n");
}
}

#include <stdio.h>
void main()
{
int i,j;
for (i=1;i<=9;i++)
{
for (j=1;j<=i;j++)
printf("%d*%d=%d ",j,i,j*i);
printf("\n");
}
}
但是为右上直角的！

应该是左下直角

#include<stdio.h>
void main()
{
int i,j;
for(i=1;i<=9;i++)
{
for(j=i;j<=9;j++)
printf("%d*%d=%-4d",i,j,i*j);
printf("\n");
}
}
貌似ok了  谢谢

问题已解决 十分感谢！
 顺便能不能帮我看看这个程序哪里错了？（vc说是switch出错了）  谢谢……
#include <stdio.h>
void main()
{
    int i;
    printf("\t\t--------------------------------------\n");
printf("\t        the menu of the data management\n");
printf("\t              1. input data\n");
printf("\t              2. otput data\n");
printf("\t              3. insert data\n");
printf("\t              4. delete data\n");
printf("\t              0. quit system\n");
    printf("\t\t--------------------------------------\n");
    printf("\t       please enter you choice:\n");
    scanf("%d", &i);
}
switch(i)
{
case 1:input data;break
case 2:output data;break
case 3:insert data;break
case 4:Delete data;break
case 0:quit system;break
default:input error;
}

我也怀疑是那，但是我改成这样    printf("\t       please enter you choice:\n");
    scanf("%d", &i);

switch(i)
{
case 1:input data;break
case 2:output data;break
case 3:insert data;break
case 4:Delete data;break
case 0:quit system;break
default:input error;
}
}
错误更多了……

我也怀疑是那，但是我改成这样  
  printf("\t       please enter you choice:\n");
    scanf("%d", &i);

switch(i)
{
case 1:input data;break
case 2:output data;break
case 3:insert data;break
case 4:Delete data;break
case 0:quit system;break
default:input error;
}
}
错误更多了……

我刚刚翻书了 想了想错误对着书上的格式来了一遍就对了。
#include <stdio.h>
void main()
{
    int i;
    printf("\t\t--------------------------------------\n");
printf("\t        the menu of the data management\n");
printf("\t              1. input data\n");
printf("\t              2. otput data\n");
printf("\t              3. insert data\n");
printf("\t              4. delete data\n");
printf("\t              0. quit system\n");
    printf("\t\t--------------------------------------\n");
    printf("\t       please enter you choice:\n");
    scanf("%d", &i);

switch(i)
{
   
case 1: printf("input data\n");break;
case 2: printf("output data\n");break;
case 3: printf("insert data\n");break;
case 4: printf("Delete data\n");break;
case 0: printf("quit system\n");break;
default :printf("input error\n");
}
}