week13-04160453

1.寫檔讀檔

a.開一個Empty file

  另存檔案

輸入

#include <stdio.h>

int main()

{

    FILE * fout = fopen("output.txt","w+");

    fprintf(fout,"Hello world\n");

}

開一個glut project

刪掉不要的東西

1.宣告檔案的指標,一開始是空的

(FILE * fout=NULL;)

2.用鍵盤存檔

void keyboard(unsigned char key, int x, int y)

{

    if(key=='s' || key=='S' || key=='w' || key=='W'){

        if(fout==NULL) fout=fopen("output.txt", "w+");

        

       

        printf("%.3f %.3f %.3f\n", angle,angle2,angle3);

        fprintf(fout, "%.3f %.3f %.3f\n", angle,angle2,angle3);

    }

}