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以下程序的输出结果是。#include int main(){ int a=2,b=7,c=5;switch(a>0){case 1:switch(b<0){case 1:printf("@");break;case 2:printf("!");break;}case 0:switch(c==5){case 0:printf("*");break;case 1:printf("#");break;default:printf("#");break;}default:printf("&");}printf("\n");return 0;}

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以下程序的输出结果是。#include int main(){ int x,y;x=5switch(x){case 1:case 2:case 3:case 4: printf("x<5\n");case 5: printf("x=5\n",x);default:printf("The value of x is unknown.\n");}return 0;}

若运行以下程序时输入：6 3 1<回车>,则程序的运行结果是。#include #include int main ( ){double a,b,c,disc,x1,x2,p,q;scanf("%lf%lf%lf",&a,&b,&c);disc=bb-4a*c;if (disc<0)printf("This equation hav't real roots\n");else{ p=-b/(2.0a);q=sqrt(disc)/(2.0a);x1=p+q;x2=p-q;printf("real roots:\nx1=%7.2f\nx2=%7.2f\n",x1,x2);}return 0;}

若运行以下程序时输入：2 4 1<回车>,则程序的运行结果是。#include #include int main ( ){double a,b,c,disc,x1,x2,p,q;scanf("%lf%lf%lf",&a,&b,&c);disc=bb-4a*c;if (disc<0)printf("This equation hav't real roots\n");else{ p=-b/(2.0a);q=sqrt(disc)/(2.0a);x1=p+q;x2=p-q;printf("real roots:\nx1=%7.2f\nx2=%7.2f\n",x1,x2);}return 0;}

若运行以下程序时输入：3.6,-3.2<回车>,则程序的运行结果是。#include int main(){float a,b,t;scanf("%f,%f",&a,&b);if(a>b){t=a;a=b;b=t;}printf("%5.2f,%5.2f\n",a,b);return 0;}