用c语言写乘法表

#include

int main(void)

{

int i,j;

for (i=1;i<=9;i++)

{

for(j=1;j<=i;j++)

printf("%2dx%d=%2d",j,i,i*j);

printf("\n");

}

}

结果：

1x1= 1

1x2= 2 2x2= 4

1x3= 3 2x3= 6 3x3= 9

1x4= 4 2x4= 8 3x4=12 4x4=16

1x5= 5 2x5=10 3x5=15 4x5=20 5x5=25

1x6= 6 2x6=12 3x6=18 4x6=24 5x6=30 6x6=36

1x7= 7 2x7=14 3x7=21 4x7=28 5x7=35 6x7=42 7x7=49

1x8= 8 2x8=16 3x8=24 5x8=40 6x8=48 7x8=56 8x8=64

1x9= 9 2x9=18 3x9=27 4x9=36 5x9=45 6x9=54 7x9=63 8x9=72 9x9=81

3．19

#include

int main(void)

{

int a=0;

printf("%8s%10s%12s\n","a","b","c");

while(a<=33)

{

int b=0;

while(b<=50)

{

int c;

c=100-a-b;

if(3*a+2*b+c/2.0==100)

printf("%8d%10d%12d\n",a,b,c);

b++;

}

a++;

}

}

a b c

2 30 68 5 25 70 8 20 72 11 15 74 14 10 76 17 5 78 20 0 80