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若运行以下程序时输入：A<回车>,则程序的运行结果是。#include int main(){char grade;scanf("%c",&grade);printf("Your score:");switch(grade){case 'A': printf("85～100\n");case 'B': printf("70～84\n");case 'C': printf("60～69\n");case 'D': printf("<60\n");default: printf("data error!\n");}return 0;}

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若运行以下程序时输入：A<回车>,则程序的运行结果是。#include int main(){void action1(int,int),action2(int,int);char ch;int a=15,b=23;ch=getchar();switch(ch){case 'a':case 'A': action1(a,b);break;case 'b':case 'B': action2(a,b);break;default: putchar('\a');}return 0;}void action1(int x,int y){printf("x+y=%d\n",x+y);}void action2(int x,int y){printf("xy=%d\n",xy);}

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若运行以下程序时输入：2012<回车>,则程序的运行结果是。#include int main(){int year,leap;scanf("%d",&year);if (year%4==0){if(year%100==0){if(year%400==0)leap=1;elseleap=0;}elseleap=1;}elseleap=0;if (leap)printf("%d is ",year);elseprintf("%d is not ",year);printf("a leap year.\n");return 0;}

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若运行以下程序时输入：2100<回车>,则程序的运行结果是。#include int main(){int year,leap;scanf("%d",&year);if (year%4==0){if(year%100==0){if(year%400==0)leap=1;elseleap=0;}elseleap=1;}elseleap=0;if (leap)printf("%d is ",year);elseprintf("%d is not ",year);printf("a leap year.\n");return 0;}

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若运行以下程序时输入：2050<回车>,则程序的运行结果是。#include int main(){int year,leap;scanf("%d",&year);if(year%4!=0)leap=0;else if (year%100!=0)leap=1;else if(year%400!=0)leap=0;elseleap=1;if (leap)printf("%d is ",year);elseprintf("%d is not ",year);printf("a leap year.\n");return 0;}

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若运行以下程序时输入：2021<回车>,则程序的运行结果是。#include int main(){int year,leap;printf("enter year:");scanf("%d",&year);if((year%4==0 && year%100!=0) || (year%400==0))leap=1;elseleap=0;if (leap)printf("%d is ",year);elseprintf("%d is not ",year);printf("a leap year.\n");return 0;}

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若运行以下程序时输入：1,2,1<回车>,则程序的运行结果是。#include #include int main(){double a,b,c,disc,x1,x2,realpart,imagpart;scanf("%lf,%lf,%lf",&a,&b,&c);printf("The equation ");if(fabs(a)<=1e-6)printf("is not a quadratic\n");else{disc=bb-4ac;if(fabs(disc)<=1e-6)printf("has two equal roots:%8.4f\n",-b/(2a));elseif(disc>1e-6){x1=(-b+sqrt(disc))/(2a);x2=(-b-sqrt(disc))/(2a);printf("has distinct real roots:%8.4f and %8.4f\n",x1,x2);}else{realpart=-b/(2a);imagpart=sqrt(-disc)/(2a);printf(" has complex roots:\n");printf("%8.4f+%8.4fi\n",realpart,imagpart);printf("%8.4f-%8.4fi\n",realpart,imagpart);}}return 0;}

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若运行以下程序时输入：1,2,2<回车>,则程序的运行结果是。#include #include int main(){double a,b,c,disc,x1,x2,realpart,imagpart;scanf("%lf,%lf,%lf",&a,&b,&c);printf("The equation ");if(fabs(a)<=1e-6)printf("is not a quadratic\n");else{disc=bb-4ac;if(fabs(disc)<=1e-6)printf("has two equal roots:%8.4f\n",-b/(2a));elseif(disc>1e-6){x1=(-b+sqrt(disc))/(2a);x2=(-b-sqrt(disc))/(2a);printf("has distinct real roots:%8.4f and %8.4f\n",x1,x2);}else{realpart=-b/(2a);imagpart=sqrt(-disc)/(2a);printf(" has complex roots:\n");printf("%8.4f+%8.4fi\n",realpart,imagpart);printf("%8.4f-%8.4fi\n",realpart,imagpart);}}return 0;}

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若运行以下程序时输入：2,6,1<回车>,则程序的运行结果是。#include #include int main(){double a,b,c,disc,x1,x2,realpart,imagpart;scanf("%lf,%lf,%lf",&a,&b,&c);printf("The equation ");if(fabs(a)<=1e-6)printf("is not a quadratic\n");else{disc=bb-4ac;if(fabs(disc)<=1e-6)printf("has two equal roots:%8.4f\n",-b/(2a));elseif(disc>1e-6){x1=(-b+sqrt(disc))/(2a);x2=(-b-sqrt(disc))/(2a);printf("has distinct real roots:%8.4f and %8.4f\n",x1,x2);}else{realpart=-b/(2a);imagpart=sqrt(-disc)/(2a);printf(" has complex roots:\n");printf("%8.4f+%8.4fi\n",realpart,imagpart);printf("%8.4f-%8.4fi\n",realpart,imagpart);}}return 0;}

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若运行以下程序时输入：100,20,300<回车>,则程序的运行结果是。#include int main(){int c,s;float p,w,d,f;printf("please enter price,weight,discount:");scanf("%f,%f,%d",&p,&w,&s);if(s>=3000)c=12;elsec=s/250;switch(c){case 0: d=0; break;case 1: d=2; break;case 2:case 3: d=5; break;case 4:case 5:case 6:case 7: d=8; break;case 8:case 9:case 10:case 11: d=10; break;case 12: d=15; break;}f = p * w * s * (1 - d / 100);printf("freight=%10.2f\n",f);return 0;}

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