C语言程序设计苏小红版答案

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1、2.2#include<stdio.h>main()float x=2.5,y=2.5,z=2.5;printf("x=%fn",x);printf("y=%fn",y);printf("z=%fn",z);3.1(1)#include<stdio.h>main()int a=12,b=3;float x=18.5,y=4.6;printf("%dn",(float)(a*b)/2);printf("%dn",(int)x%(int)y);3.2#include<s

2、tdio.h>main()int x,b0,b1,b2,s;printf("Inputx:");scanf("%d",&x);b2=x/100;b1=(x-b2*100)/10;b0=x%10;s=b0*100+b1*10+b2;printf("s=%dn",s);3.3#include<stdio.h>#include<math.h>main()float rate=0.0225;float n,capital,deposit;printf("Input n,capital:"

3、;);scanf("%f,%f",&n,&capital);deposit=capital*pow(1+rate,n);printf("deposit=%fn",deposit);3.4#include<stdio.h>#include<math.h>main()float a,b,c;double x,y;printf("Inputa,b,c:");scanf("%f,%f,%f",&a,&b,&c);x=(-b+sqrt(b*b-4*a*c)/(2

4、*a);y=(-b-sqrt(b*b-4*a*c)/(2*a);printf("x=%f,y=%fn",x,y);4.1(1)#include<stdio.h>main()char c1='a',c2='b',c3='c'printf("a%cb%cc%cn",c1,c2,c3);4.1(2)#include<stdio.h>main()int a=12,b=15;printf("a=%d%,b=%d%n",a,b);4.1(3)#include<stdio

5、.h>main()int a,b;scanf("%2d%*2s%2d",&a,&b);printf("%d,%dn",a,b);4.2#include<stdio.h>main()long a,b;float x,y;scanf("%d,%dn",&a,&b);scanf("%f,%fn",&x,&y);printf("a=%d,b=%dn",a,b);printf("x=%f,b=%fn",x,y);5.1#

6、include<stdio.h>main()float a;printf("Innputa:");scanf("%f",&a);if(a>=0)a=a;printf("a=%fn",a);elsea=-a;printf("a=%fn",a);5.2#include<stdio.h>main()int a;printf("Inputa:");scanf("%d",&a);if(a%2=0)printf("a 是偶数 &qu

7、ot;);elseprintf("a 是奇数 ");5.3#include<stdio.h>#include<math.h>main()float a,b,c,s,area;printf("Inputa,b,c:");scanf("%f,%f,%f",&a,&b,&c);if(a+b>c&&a+c>b&&b+c>a)s=(a+b+c)/2;area=(float)sqrt(s*(s-a)*(s-b)*(s-c);printf("

8、area=%fn",area);elseprintf(" 不是三角形 ");5.4#include<stdio.h>#include<math.h>main()float a,b,c,x,y;printf("Inputa,b,c:");scanf("%f,%f,%f",&a,&b,&c);if(a=0)printf(" 该方程不是一元二次方程n");if(b*b-4*a*c>0)x=(-b+sqrt(b*b-4*a*c)/(2*a);y=(-b-sqr

9、t(b*b-4*a*c)/(2*a);printf("x=%f,y=%fn",x,y);else if(b*b-4*a*c=0)x=-b/(2*a);y=-b/(2*a);printf("x=%f,y=%fn",x,y);elseprintf(" 该方程无实根n");5.5#include<stdio.h>main()int year,flag;printf("Input a year:");scanf("%d",&year);if(year%4=0&&yea

10、r%400!=0|year%400=0)flag=1;elseflag=0;if(flag=1)printf("%d is a leap year !n",year);elseprintf("%d is not a leap year !n",year);5.6#include<stdio.h>main()int year,flag;printf("Input a year:");scanf("%d",&year);flag=year%400=0|year%4=0&&year%1

11、00!=0?1:0;if(flag=1&&flag!=0)printf("%d is a leap year !n",year);elseprintf("%d is not a leap year !n",year);5.7#include<stdio.h>main()char ch;printf("Inputch:");scanf("%c",&ch);if(ch>='a'&&ch<='z')ch=getchar();c