#include <stdio.h>

int main()
{
    int number1,number2;
    double average=0.0;

    printf("请输入第一个整数：");

    scanf("%d",&number1);

    printf("请输入第二个整数：");

    scanf("%d",&number2);

    average = (double)(number1+number2)/2;//类型转换就行了

    printf("%f\n",average);

    return 0;
}

#include <stdio.h>

int main()
{
    int number1,number2;
    double average=0.0;

    printf("请输入第一个整数：");

    scanf("%d",&number1);

    printf("请输入第二个整数：");

    scanf("%d",&number2);

    average = (double)(number1+number2)/2;//类型转换就行了

    printf("%f\n",average);

    return 0;
}