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1、1编写程序,把560分钟换算成用小时和分钟表示,然后进行输出答案:#includemain(){inttime,hour,min,; scanf("%d",&time);hour=time/60;min=time%60;printf("%dmin%dhour%dmins",tine,hour,min);}2编写程序,读入三个整数a、b、c,然后交换它们的取值,把a的值给b,把b的值给c,把c的值给a。答案:#includemain(){inta,b,c;scanf("%d%d%d"
2、,&a,&b,&c);swap(a,b);swap(a,c);printf("%3d%3d%3d",a,b,c);return0;}voidswap(int&a,int&b){intc;c=a;a=b;b=c;}第四章1模拟计算机功能,编写程序,根据用户输入的运算符,对两个数进行运算。(用switch语句。)答案:#includemain(){floatx,y;charoperator;scanf(“%f,%c,%f”,&x,&operator,&y)switch(operator){case`+`:prin
3、tf(“%.2f+%.2f”,x,y,x+y);break;case`-`:printf(“%.2f-%.2f”,x,y,x-y);break;case`*`:printf(“%.2f-%.2f”,x,y,x*y);break;case`/`:printf(“%.2f-%.2f”,x,y,x/y);break;case`/`:if(y==0){printf(“error!”);break;}printf(“%.2f-%.2f”,x,y,x/y);break;default:printf(“operatorisi
4、nvalid”);}}2输入三角形的三条边a、b、c,求三角形的面积。答案:#include"stdio.h"#include"math.h"main(){doublea,b,c;doubles;doublearea;printf("inputa,b,c:");scanf("%lf%lf%lf",&a,&b,&c);if(a+b>c&&a+c>b&&b+c>a){s=(a+b+c)/2;area=sqrt(s*(s-a)*(s-b)*(s-c));printf("theareais:%g",area);}elseprint
5、f("Error!thisisnotatriangle!");}3编写程序,输入一位学生的生日(年y0、月m0、日d0)和当前的日期(年y1、月m1、日d1),输出该生的实际年龄。#includemain(){inty0,m0,d0,y1,m1,d1;if(y1>y0){if(m0>m1)printf("%d",y1-y0-1);elseif(m0d1)printf("%d",y1-y0);elesif(d0>d1)printf("%d",y1-y0-
6、1);}}4有一个函数:y=x(-5-5&&x<0)printf("y=%f",x);if(x==0)printf("y=%f",x-1);if(x>0&&x<10)printf("y=%f",x+1);i
7、f(x<=-5
8、
9、x>=10)printf("inputerror");}(2)嵌套的if语句main(){floatx;printf("inputx:");scanf("%f",&x);if(x>-5&&x<10){if(x==0)printf("y=%f",x-1);if(x<0)printf("y=%f",x);if(x>0)printf("y=%f",x+1);}if(x<=-5
10、
11、x>=10)printf("inputerror");}(3)if_else语句main(){floatx;printf("inputx:
12、");scanf("%f",&x);if(x>-5&&x<10)if(x<0)printf("y=%f",x-1);elseif(x==0)printf("y=%f",x);elseprintf("y=%f",x+1);elseprintf("