#include"math.h"
main()
{
float a,b,c;
a=3;
b=2;
c=a+b;
printf("%d,%d,%d",a,b,c)
}

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#include"stdio.h"
void main()
{
float a,b,c;
a=3;
b=2;
c=a+b;
printf("%f,%f,%f",a,b,c);
}

printf("%d,%d,%d",a,b,c)可改为:
printf("%f,%f,%f",a,b,c);//或
printf("%d,%d,%d",(int)a,(int)b,(int)c);

#include"math.h"
main()
{
float a,b,c;  ----->你这里要浮点型的数据类型
a=3;
b=2;
c=a+b;
printf("%d,%d,%d",a,b,c)   --->%d  是输出整数类型数据 改为%f  或改前面   float ->int

}

#include"math.h"
main()
{
int a,b,c;
a=3;
b=2;
c=a+b;
printf("%d,%d,%d",a,b,c);
getch();
}

2楼4楼正解!