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C_ex

1.Hello World

#include <stdio.h>
void main()
{
 /* 印出 Hello */
printf("Hello World!");
}

2.Say Hello World! Bye Bye

#include <stdio.h>
int main()
{
/* 印出 Hello World! Bye Bye */
printf("Hello World! ");
printf("Bye ");
printf("Bye");
return 0;
}

3.變數宣告的例子

#include <stdio.h>
int main()
{
int a = 1;
int A = 8;
int b = 2, c;
c = A - a + b;
/* 輸出 a, A, b, c 到螢幕 */
printf( "a = %d, A = %d, b = %d, c = %d ", a, A, b, c );
return 0;
}

4.浮點運算的程式範例

#include <stdio.h>
void main()
{
float a = 0.5;
double b = 1.2;
int c = 3;
b = b + a + c;
/* 輸出 a, b, c 到螢幕 */
printf( " a = %3.1f, b = %3.1f, c = %d ", a ,b, c );
}

5.字元範例

#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;
}

6.digital - 1

#include <stdio.h>
 
int main() {
    int a = 64;
    int b = 0x40;
    long c = 64L;
 
    printf("%d,%d,%ld", a, b, c);  // 使用 %ld 來打印 long 整數型別的變數 c
 
    return 0;
}

7.輸入一個整數

#include <stdio.h>
int main()
{
int i;
printf("Input an integer:");
scanf( "%d", &i ); /* ch 前面加個 &(位址運算元) */
printf( "the number is %d", i );
return 0;
}

8.基本運算範例

#include<stdio.h>
int main()
{
int a,b;
a = 10; b = 3;
printf( "%d \n", a * b );
printf( "%d \n", a / b );
printf( "%d \n", a + b );
printf( "%d \n", a - b );
printf( "%d \n", a % b );
return 0;
}

9.關係運算元的範例

#include <stdio.h>
int main()
{
int a = 10, b = 5;
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" );
b = 10;
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;
}

10.位元運算元的範例

#include<stdio.h>
void main()
{
int a,b;
a = 15;
b = 1;
printf("%d \n", a | b ); /* a OR b */
printf("%d \n", a & b ); /* a AND b */
printf("%d \n", a ^ b ); /* a XOR b */
printf("%d \n", a << 1 ); /* a 位元左移 1 位 */
printf("%d \n", a >> 1 ); /* a 位元右移一位 */
printf("%d \n", ~a ); /* A 的補數運算 */
}

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