实验二

part 1

(1)

#include <stdio.h>
int main() {
    int x=1234;
    float f=123.456;
    double m=123.456;
    char ch='a';
    char a[]="Hello, world!"; // 定义一个数组a,数组中连续存放了字符串常量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;
}

（2）修改后

#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);
    scanf("%c%c%c",&c1,&c2,&c3);
    printf("%c%c%c\n",c1,c2,c3);
    scanf("%lf,%lf",&x,&y);
    printf("%f,%lf\n",x,y);
      return 0;
}

part 2

#include <stdio.h>
int main (){
    char ch;
    ch = 'A';
    putchar(ch);
    putchar(ch+32);
    putchar('\x41');
    putchar('\n');
    return 0 ;
}

#include<stdio.h>
int main()
{
    char ch;
    ch = getchar();
    putchar(ch);
    printf("%c",ch);
    return 0;
}

switch从句

#include <stdio.h>
int main(){
    int level;
    printf("输入现在状态等级（1-5）：");
    scanf("%d",&level);
    switch(level){
        case 1:printf("high翻了:)\n");break;
        case 2:printf("low爆了:(\n");break;
        default:printf("一言难尽，无法概括\n");
    }
    return 0;
} 

part 5 简单编程练习

#include <stdio.h>
int main(){
    char answer;
    printf("请输入你的答案(A,B,C or D):");
    scanf("%c",&answer);
    if(answer=='A')
       printf("Binggo,you are right~\n");
    else 
       printf("try again~\n");
    return 0;
}

实验总结：要注意输入时输入法的中英文和大小写的状态

要多加练习，熟练使用各字符