实验2 C语言表达式编程应用及输入输出函数（ 后附炫彩小人：） ）

#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 x=1234;
    float f=123.456;
    double m=123.456;
    char ch=‘a‘;
    char a[]="Hello,world!";
    int y=3,z=4;
    
    printf("%d %d\n",y,z);
    printf("y=%d, z=%d\n", y,z);
    printf("%8d,%2d\n", x,x);
    printf("%f, %8f, %8.1f, %0.2f, %.2e\n",f,f,f,f,f);
    printf("%lf\n",m);
    printf("%3c\n", ch);
    printf("%s\n%15s\n%10.5s\n%2.5s\n%.3s\n",a,a,a,a,a);
    
    return 0;
} 

#include <stdio.h>
int main(){
    double x,y;
    char c1,c2,c3;
    int a1,a2,a3;
    
    scanf ("%d%d%d",&a1,&a2,&a3);
    printf("%d,%d,%d\n",a1,a2,a3);
    getchar();
    scanf("%c%c%c",&c1,&c2,&c3);
    printf("%c %c %c\n",c1,c2,c3);
    scanf("%lf%lf",&x,&y);
    printf("%f,%f\n",x,y);
    
    
    return 0;
}

#include <stdio.h>
int main(){
    
    char x;
    x = getchar();
    if(x>=‘0‘&&x<=‘9‘)
        printf("%c是数字字符\n", x);
    else if(x>=‘a‘&&x<=‘z‘||x>=‘A‘&&x<=‘Z‘)
        printf("%c是英文字母\n", x);
    else
        printf("%c是其它字符\n", x);
    return 0;
}

#include <stdio.h>
int main() {
    char ans1, ans2;
    
    printf("复习了没? (输入y或Y表示复习了，输入n或N表示没复习) :  ");
    ans1 = getchar();  // 从键盘输入一个字符，赋值给ans1
    
    getchar(); // 思考这里为什么要加这一行 
    
    printf("\n动手敲代码了没? (输入y或Y表示敲了，输入n或N表示木有敲) :  ");
    ans2 = getchar();
    
    if((ans1==‘y‘||ans1==‘Y‘)&&(ans2==‘y‘||ans2==‘Y‘))
        printf("\n罗马不是一天建成的:)\n");    
    else
        printf("\n罗马不是一天毁灭的。。。\n");

    return 0;
} 

#include <stdio.h>
int main (){
    int n,sum,t;
    sum=2;
    scanf("%d",&n);
    if (n>=1 && n<=10){
        for (t=1;t<=n;t++){
            sum=sum*2;
        }
        sum=sum-1;
        printf("n = %d时，sum = %d",n,sum);
    }
    else {
        printf ("beyond limitation!");
    }
} 

#include <stdio.h>
#include <stdlib.h>
#include <windows.h> 
int main (){
    int n,i,j;
    for(n=1;n<=5;n++){
        for (j=1;j<n;j++){
            printf("        ");
        }
        for (j=1;j<=(11-2*n);j++){
            printf (" 0 ");
            if (j<(11-2*n)){
                printf ("     ");
            }
        }
        printf ("\n");
        for (j=1;j<n;j++){
            printf("        ");
        }
        for (j=1;j<=(11-2*n);j++){
            printf ("<H>");
            if (i<(11-2*n)){
                printf ("     ");
            }
        }
        printf ("\n");
        for (j=1;j<n;j++){
            printf("        ");
        }
        system("color f0");
        for (j=1;j<=(11-2*n);j++){
            printf ("I I");
            if (i<(11-2*n)){
                printf ("     ");
            }
        }
        printf ("\n\n");
    }
    system("color f0");
    Sleep(2000);
    for (n=1;n<=10;n++){
        system("color f4");
        Sleep(500);
        system("color f6");
        Sleep(500);
        system("color f2");
        Sleep(500);
        system("color f1");
        Sleep(500);
        system("color f9");
        Sleep(500);
        system("color f5");
        Sleep(500);
    }
    return 0;
}

#include <stdlib.h>
{
    system (color xy);
}

#include <windows.h>
{
    Sleep(time);
}