用C语言输出正弦函数波形

 

#include <stdio.h>
#include <math.h>
#define N 32

int main()
{
    FILE *fp;
    fp = fopen("sin.txt", "w");
    int a[N] = {0};
    for (int i = 0; i < N; i++)
    {
        a[i] = (int)(sin(2 * M_PI * i / N) * 16);
        a[i] = a[i] + 16;
    }
    for (int i = 0; i < N; i++)
    {
        for (int j = 0; j < a[i]; j++)
        {
            if (fp == NULL)
            {
                printf("Error!");
                exit(0);
            }
            fprintf(fp, " ");
        }
        if (fp == NULL)
        {
            printf("Error!");
            exit(0);
        }
        fprintf(fp, "*\n");
    }
    fclose(fp);
    return 0;
}

        首先