列印字串 Hello World！ 的解說

#‎include ‬<stdio.h> //#include：引入stdio.h檔案     stdio.h：系統的引入檔

int main() //int : 宣告其回傳值為整數    main : 函數(本程式的主要函數)

{

printf("Hello, World! \n"); //printf：輸出到螢幕,列印出Hello world！   \n : 換行字元

return 0; //將整數0回傳給呼叫main的函數

}

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一次做完加減乘除

#include <stdio.h>

int main()

{

int first, second, add, subtract, multiply;

float divide;

printf("Enter two integers\n");

scanf("%d%d", &first, &second);

add = first + second;

subtract = first - second;

multiply = first * second;

divide = first / (float)second; //typecasting

printf("Sum = %d\n",add);

printf("Difference = %d\n",subtract);

printf("Multiplication = %d\n",multiply);

printf("Division = %.2f\n",divide);

return 0;

}

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判斷偶數和奇數

使用if...else來判斷偶數(Even)和奇數(Odd)

#include <stdio.h>

int main()

{

int n;

printf("Enter an integer\n");

scanf("%d", &n);

if (n%2 == 0)

printf("Even\n");

else printf("Odd\n");

return 0;

}

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