C语言实现绘制余弦曲线

/*******************************************************************
 *   > File Name: 001_cos.c
 *   > Author: fly
 *   > Mail: XXXXXXXX@icode.com
 *   > Create Time: 2020年06月01日 星期一 09时24分59秒
 ******************************************************************/

#include <stdio.h>
#include <math.h>
#include "debug.h"

void test_acos(void)
{
    double x = 0.0;
    double y = 0.0;
    int m = 0;

    for(x= -1.0; x<=1.0; x+=0.1)
    {
        y = acos(x);
        m = y * 10;
        printf("x = %f, y = %f[%d]\n", x, y, m);
    }
}

void printf_cos(void)
{
    printf("========Draw Cos(x)========\n");

    double x = 0.0, y = 0.0;
    int m, n;

    for(y = 1.0; y >= -1.0; y-=0.1)
    {
        x = acos(y);
        m = x * 10;
        //printf("(%f, %f)%d\n", x,y,m);
        for(n = 0; n <=m; n++)
            printf(" ");
        printf(RED"*"NONE);

        for(; n<62-m; n++)
            printf(" ");

        printf(RED"*\n"NONE);
    }
}

int main(int argc, char* argv[])
{
    DBG_PRINTF("Hello, world !\n");
    //test_acos();
    printf_cos();

    return 0;
}

#ifndef __DEBUG_H__
#define __DEBUG_H__

#include <string.h>

#define DBG_PRINTF_FUNC         (1)
#define DBG_PRINTF_SWITCH       (1)

// color debug
#define NONE            "\e[m"
#define BLACK           "\e[0;30m"
#define RED                     "\e[0;31m"
#define GREEN           "\e[0;32m"
#define YELLOW          "\e[0;33m"
#define BLUE            "\e[0;34m"

#ifdef DBG_PRINTF_FUNC
#define DBG_PRINTF(fmt, args...)        \
                do{\
                printf("<<FILE:"BLUE"%s"NONE" LINE:"RED"%d"NONE" FUNC:"GREEN"%s"NONE">>", \
                strrchr(__FILE__, '/')?strrchr(__FILE__, '/')+1:__FILE__, __LINE__, __FUNCTION__);\
                printf(fmt, ##args);\
                }while(0)
#else
#define DBG_PRINTF(fmt, args...)
#endif /* DBG_PRINTF_FUNC */

#endif /* __DEBUG_H__ */

SRC = ${wildcard *.c}
BIN = ${patsubst %.c, %, $(SRC)}
CFLAGS = -g -Wall
#INC = -lm
LIBS = -lm

all:$(BIN)

$(BIN):%:%.c
        $(CC) -o $@ $< $(CFLAGS) $(LIBS)

clean:
        $(RM) a.out $(BIN)

.PHONY:all clean