如何用c语言编写斐波那契数列

在C语言中编写斐波那契数列，你可以通过循环或者递归的方式来实现。以下是两种常见的方法：

**1. 循环法（迭代法）**：

#include <stdio.h>

void fibonacci(int n) {
    int t1 = 0, t2 = 1, nextTerm;

    printf("Fibonacci Series up to %d terms:\n", n);

    for (int i = 1; i <= n; ++i) {
        if(i == 1 || i == 2) {
            nextTerm = i;
        } else {
            nextTerm = t1 + t2;
            t1 = t2;
            t2 = nextTerm;
        }
        printf("%d ", nextTerm);
    }
}

int main() {
    int numTerms;
    printf("Enter the number of terms: ");
    scanf("%d", &numTerms);
    fibonacci(numTerms);
    return 0;
}

**2. 递归法**：

#include <stdio.h>

// 使用递归函数计算斐波那契数
int fibonacci(int n) {
    if(n <= 1)
        return n;
    else
        return(fibonacci(n-1) + fibonacci(n-2));
}

int main() {
    int num;
    printf("Enter a positive integer: ");
    scanf("%d", &num);

    if(num <= 0){
        printf("Invalid input! Please enter a positive integer.\n");
    } else {
        printf("Fibonacci sequence for %d terms is: \n", num);
        for(int i=0; i<num; ++i)
            printf("%d, ", fibonacci(i));
    }

    return 0;
}