上面的有错吧，别人说输入的a,b是变量，不是常量。第1题：main(){int i,sum=0;for(i=1;i<=10;i++)sum=sum+i;printf("%d",sum);}第2题：main(){int i,s=1;for(i=1;i<=10;i++)s=s*i;printf("%d",s);}第3题：main(){float a,b,t;printf("Please input two numbers:\n");scanf("%f,%f",&a,&b);t=a;a=b;b=t;printf("%f,%f\n",a,b);}第4题：main()(float a,b,sum;printf("Please input two numbers:\n");scanf("%f,%f",&a,&b);sum=a+b;printf("sum=%d\n",sum);)第5题：main()(float a,b,m;printf("Please input two numbers:\n");scanf("%f,%f",&a,&b);m=(a<b)?a:b;printf("m=%d\n",m);)