c语言程序输出所有四则运算算式答案代码正确版

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

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

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

#include <stdio.h>
int main()
{
float a,b,c;
for(a=0;a<=9;a++){
for(b=0;b<=9;b++){
printf("%f÷%f=%f\n",a,b,a/b);
}
}
}