c語言小程序(c語言10個經典小程序)

Hello World

#include <stdio.h>int main() {    printf("Hello, World!\n");    return 0;}

計算兩數之和

#include <stdio.h>int main() {    int num1 = 5, num2 = 10;    int sum = num1 + num2;    printf("The sum of %d and %d is %d\n", num1, num2, sum);    return 0;}

判斷奇偶數

#include <stdio.h>int main() {    int num = 6;    if(num % 2 == 0) {        printf("%d is an even number\n", num);    } else {        printf("%d is an odd number\n", num);    }    return 0;}

找出最大數

#include <stdio.h>int main() {    int num1 = 10, num2 = 20, num3 = 15;    int max;    max = (num1 > num2) ? ((num1 > num3) ? num1 : num3) : ((num2 > num3) ? num2 : num3);    printf("The largest number is %d\n", max);    return 0;}

計算階乘

#include <stdio.h>int main() {    int num = 5;    int factorial = 1;    for(int i = 1; i <= num; i++) {        factorial *= i;    }    printf("Factorial of %d is %d\n", num, factorial);    return 0;}

判斷素數

#include <stdio.h>int main() {    int num = 7;    int isPrime = 1;    for(int i = 2; i <= num / 2; i++) {        if(num % i == 0) {            isPrime = 0;            break;        }    }    if(isPrime) {        printf("%d is a prime number\n", num);    } else {        printf("%d is not a prime number\n", num);    }    return 0;}

反轉數組

#include <stdio.h>int main() {    int arr[] = {1, 2, 3, 4, 5};    int n = sizeof(arr) / sizeof(arr[0]);    printf("Original array: ");    for(int i = 0; i < n; i++) {        printf("%d ", arr[i]);    }    printf("\nReversed array: ");    for(int i = n-1; i >= 0; i--) {        printf("%d ", arr[i]);    }    return 0;}

斐波那契數列

#include <stdio.h>int main() {    int n = 10;    int first = 0, second = 1, next;    for(int i = 0; i < n; i++) {        if(i <= 1) {            next = i;        } else {            next = first + second;            first = second;            second = next;        }        printf("%d ", next);    }    return 0;}

冒泡排序

#include <stdio.h>void bubbleSort(int arr[], int n) {    for(int i = 0; i < n-1; i++) {        for(int j = 0; j < n-i-1; j++) {            if(arr[j] > arr[j+1]) {                int temp = arr[j];                arr[j] = arr[j+1];                arr[j+1] = temp;            }        }    }}int main() {    int arr[] = {64, 34, 25, 12, 22, 11, 90};    int n = sizeof(arr) / sizeof(arr[0]);    bubbleSort(arr, n);    printf("Sorted array: ");    for(int i = 0; i < n; i++) {        printf("%d ", arr[i]);    }    return 0;}

矩陣乘法

#include <stdio.h>int main() {    int mat1[2][2] = {{1, 2}, {3, 4}};    int mat2[2][2] = {{5, 6}, {7, 8}};    int res[2][2];    for(int i = 0; i <