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c_EX

#include <stdio.h>
 
int main()
{
float a = 0.5;
double b = 1.2;
int c = 3;
b = b + a + c;
 
/* 输出 a, b, c 到屏幕 */
printf("a = %3.1f, b = %3.1f, c = %d\n", a, b, c);
 
return 0;
}

/* ====================
   字元範例 1
   ==================== */
#include <stdio.h>
 
int main()
{
    char x, y;
 
    x = 'a';
    y = (char)97;
 
    /* 輸出 x, y, x, 最後一個是以 ASCII 值顯示 y */
    printf("x = %c, y = %c, ASCII of y = %d", x, y, y);
 
    return 0;
}

#include <stdio.h>
 
int main()
{
    int a = 64;
    int b = 0x40; // 以十六进制表示
    long c = 64L;
 
    // 打印变量的值
    printf("%d, %d, %ld", a, b, c);
 
    return 0;
}

#include <stdio.h>
 
int main()
{
    int a = 10, b = 5;
 
    // 第一组比较
    printf("a == b is %d\n", a == b);
    printf("a > b is %d\n", a > b);
    printf("a < b is %d\n", a < b);
    printf("a >= b is %d\n", a >= b);
    printf("a <= b is %d\n", a <= b);
    printf("a != b is %d\n", a != b);
 
    printf("\n");
 
    // 修改 b 的值
    b = 10;
 
    // 第二组比较
    printf("a == b is %d\n", a == b);
    printf("a > b is %d\n", a > b);
    printf("a < b is %d\n", a < b);
    printf("a >= b is %d\n", a >= b);
    printf("a <= b is %d\n", a <= b);
    printf("a != b is %d\n", a != b);
 
    return 0;
}

#include <stdio.h>
 
void main()
{
int a;
 
// 第一次输出
a = 3;
printf("%d\n", !a); // 逻辑非运算，a为真，所以输出0
 
// 第二次输出
a = 0;
printf("%d\n", !a); // 逻辑非运算，a为假，所以输出1
}

#include <stdio.h>
 
void main()
{
    char a;
 
    // 使用 %zu 格式说明符输出 size_t 类型
    printf("The size of int is %zu\n", sizeof(int));
 
    // 使用 %zu 格式说明符输出 size_t 类型
    printf("The size of char a is %zu\n", sizeof(a));
}

#include <stdio.h>
 
/* ====================
计算长方形面积, 需传入长与宽.
==================== */
int rect(int x, int y)
{
    int result;
    result = x * y;
    return result; /* 返回 result */
}
 
/* ====================
主函数
==================== */
int main()
{
    int x = 8, y = 4;
    int a;
    a = rect(x, y);
    printf("8*4 的面积是 %d", a);
    return 0;
}

#include <stdio.h>
float circle( int r ); /* 宣告 circle 的 prototype */
void main()
{
float answer;
answer = circle(8);
printf( " 圓周長度是 %f", answer );
}
/* ====================
 circle 函數, 計算 circle 的圓周長
==================== */
float circle( int r )
{
float result;
result = 3.14159 * (double)1001 * r;
return ( result );
}

#include <stdio.h>
 
int main()
{
    char ch;
 
    printf("输入一个字符：");
 
    // 检查 scanf 的返回值，确保成功读取一个字符
    if (scanf(" %c", &ch) != 1) {
        printf("读取字符失败\n");
        return 1; // 或者采取其他错误处理措施
    }
 
    if (ch == 'a') {
        printf("您按下了 'a'\n");
    }
 
    return 0;
}

10.

#include <stdio.h>
 
void main()
{
    int i;
 
    // 提示用户输入一个整数
    printf("100：");
 
    // 读取用户输入的整数
    scanf("%d", &i);
 
    // 判断输入的整数，并输出相应的消息
    if (i < 100)
    {
        printf("i < 100\n");
    }
    else
    {
        if ((i >= 100) && (i < 200))
        {
            printf("i >= 100 且 i < 200\n");
        }
        else
        {
            printf("i >= 200\n");
        }
    }
}

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