#include?<stdio.h>
int?main()?{
????int?i,j;??//?i,?j控制行或列?
????for(i=1;i<=9;i++)?{
????????for(j=1;j<=9;j++)
????????????//?%2d?控制寬度為兩個(gè)字符，且右對(duì)齊；如果改為?%-2d?則為左對(duì)齊
????????????//?\t為tab縮進(jìn)
????????????printf("%d*%d=%2d\t",?i,?j,?i*j);

????????printf("\n");
????}

????return?0;
}

輸出：

1*1= 1 1*2= 2 1*3= 3 1*4= 4 1*5= 5 1*6= 6 1*7= 7 1*8= 8 1*9= 9

2*1= 2 2*2= 4 2*3= 6 2*4= 8 2*5=10 2*6=12 2*7=14 2*8=16 2*9=18

3*1= 3 3*2= 6 3*3= 9 3*4=12 3*5=15 3*6=18 3*7=21 3*8=24 3*9=27

4*1= 4 4*2= 8 4*3=12 4*4=16 4*5=20 4*6=24 4*7=28 4*8=32 4*9=36

5*1= 5 5*2=10 5*3=15 5*4=20 5*5=25 5*6=30 5*7=35 5*8=40 5*9=45

6*1= 6 6*2=12 6*3=18 6*4=24 6*5=30 6*6=36 6*7=42 6*8=48 6*9=54

7*1= 7 7*2=14 7*3=21 7*4=28 7*5=35 7*6=42 7*7=49 7*8=56 7*9=63

8*1= 8 8*2=16 8*3=24 8*4=32 8*5=40 8*6=48 8*7=56 8*8=64 8*9=72

9*1= 9 9*2=18 9*3=27 9*4=36 9*5=45 9*6=54 9*7=63 9*8=72 9*9=81

#include<stdio.h>
int main()
{
??? int a,b;
??? for (a=1;a<=9;a++){
??????? for (b=1;b<=9;b++){
??????? printf ("%d*%d=%d" ,a,b,a*b);
??????? if (a*b<10)
??????? printf ("? ");
??????? else
??????? printf (" ");//讓矩陣更方
??? }
???????? printf ("\n");
????????
??? }
??? return 0;
}

#include<stdio.h>
main()
{
?int?a,b,c;
?int?n=0,x=0;
?for(a=1;a<10;a++)
?{
??for(b=1;b<10;b++)?
{
???c=a*b;
???printf("%d*%d=%d???",b,a,c);
???n++;
???if(n%9==0)
?????printf("\n");
??}
?}
}