实验1 C语言开发环境使用和数据类型、运算符、表达式

/*This is first C program*/ 
#include<stdio.h>
int main()
{
    printf("201983270522\n");
    printf("Hello,Mars!");
    return 0;
}

#include<stdio.h>
int main()
{
    int a=5,b=7,c=100,d,e,f;
    d=a/b*c;
    e=a*c/b;
    f=c/b*a;
    printf("d=%d,e=%d,f=%d\n",d,e,f);

    return 0;
}

#include<stdio.h>
int main()
{
    int a=5,b=8;
    printf("a++=%d\n",a++);
    printf("a=%d\n",a);
    printf("++b=%d\n",++b);
    printf("b=%d\n,b" );
    return 0; 
 }

#include<stdio.h>
int main()
{
    int a=5,b=8,c=8;
    printf("%d,%d,%d,%d\n",a==b&&a==c,a!=b&&a!=c,a>=b&&a>=c,a<=b&&a<=c);
    printf("%d,%d\n",a<=b||a>=c,a==b||b==c);
    printf("%d,%d,%d,%d\n",!(a==b),!(a>=b),!(a>=c),!(a<=b)) ;    
    return 0;
}

#include <stdio.h> 
  int main() {
    int x;
    printf("输入一个整数: \n");
    scanf("%d",&x);
    if("x%2==1") 
        printf("是奇数");
    else
        printf("是偶数"); 
     
    return 0;
  }

#include<stdio.h>
int main(){
int days;
printf("输入一个整数:\n");
scanf("%d",&days);
if(days>=1&&days<=5)
printf("Workdays,fighting\n");
else if(days==6||days==7)
printf("Weekend,relax~\n");
else
printf("Ooops,not in 1~7\n");
return 0;
}

#include<stdio.h>
int main(){
char ch;
printf("输入一个字符:\n");
scanf("%c",&ch);
if(ch<=122&&ch>=97)
ch=ch-32;
printf("%c\n",ch);
return 0;
}