第三次作业

1.编写程序,判断一个数n是正数还是负数.

#include<stdio.h>

main()

{

       float n;

       scanf("%f",&n);

       if(n>0)

       printf("正数!\n");

       else if(n==0)

       printf("0既不是正数也不是负数!\n");

       else

       printf("负数\n");

 

 

}

 

 

 

 

 

 

2.编写程序,计算出租车的行驶距离与费用之间的关系.起步3km内,8元.,之后1.6元/km.

#include<stdio.h>

main()

{

       float s,l;

       printf("输入的行驶距离:\n");

    scanf("%f",&l);

       if(1<=3)

       

              s=8;

       else

           s=(1-3)*1.6+8;

       printf("%.2f\n",s);

}

 

 

 

3.输入一个数,判断是奇数还是偶数.

#include<stdio.h>

main()

{

       float n;

       scanf("%f",&n);

       if(n>0)

       printf("奇数!\n");

       else if(n==0)

       printf("\n");

       else

       printf("偶数\n");

}

 

4.输入一个数,输出它的绝对值.

#include<stdio.h>

main()

{

       int a;

       scanf("%d",&a);

       if(a>=0)

              printf("%d\n",a);

       else

              a=a*(-1);

           printf("%d\n",a);

}

 

 

 

 

 

 

 

 

5输入两个数,输出较大数

 

#include<stdio.h>

main()

{

       int a,b;

       printf("输入两个数:\n");

       scanf("%d %d",&a,&b);

       if(a>b)

         printf("max=%d\n",a);

       else

            printf("max=%d\n",b);

 

}