题目内容

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;}

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;}

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;}

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;}