程序代码：

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main()
{
    int x,y,sum,count=0;
    srand(time(NULL));
    for(int i=0;i<10;i++)
    {
        x= rand()%99+1;
        y= rand()%(99-x)+1;
        printf("%d+%d=",x,y);
        scanf("%d",&sum);
        if(sum==x+y)
        {
            printf("正确\n");
            count++;
            continue;
        }
        printf("错误\n");        
    }
    printf("共答对%d道题\n",count);
    return 0;
}
    

[此贴子已经被作者于2021-12-7 08:51编辑过]

程序代码：

#include <stdio.h>
#include <stdlib.h>

unsigned foo( unsigned a, unsigned b )
{
    return (unsigned)( (b-a+1)/(RAND_MAX+1.0) * rand() + a );
}

int main( void )
{
    // srand 自己加
    // “输入每个算式的计算结果，判断计算是否正确，输出成绩”等无意义的体力活自己做
    for( size_t i=0; i!=10; ++i )
    {
        unsigned a = foo( 1, 99 );
        unsigned b = foo( 1, 100-a );
        printf( "%2u + %2u = %u\n", a, b, a+b );
    }
}