A

    

 week14

1.今日課程:寫檔fprintf()、讀檔fscanf()、寫檔fprintf()+project、讀檔fscanf()+project

1.1  程式碼:#include<stdio.h>

int main()

{

///檔案指標fout 開啟檔案(檔名,write模式)

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

    printf("Hello world\n");

    fprintf(fout,"Hello world\n");

    fclose(fout);

}

1.2  程式碼:#include<stdio.h>

int main()

{

///檔案指標fout 開啟檔案(檔名,write模式)

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

    fprintf(fout,"3.1415926\n");

    fclose(fout);///關檔

    float angle =0;

    FILE * fin=fopen("file.txt","r");

    fscanf(fin,"%f",&angle);///沒加&會當

    printf("讀到了角度:%f",angle);

    fclose(fin);

}

1.3 加上my read 按下鍵盤r可以撥放音樂

#include <opencv/highgui.h>  #include <opencv/cv.h>  #include <GL/glut.h>  #include <stdio.h> float angle[20],oldx=0; int angleID=0; FILE * fout = NULL,* fin= NULL; void myWrite() { if(fout==NULL) fout=fopen("file.txt","w+"); for(int i=0;i<20;i++) { printf("%.1f",angle[i]); fprintf(fout,"%.1f",angle[i]); } printf("\n"); fprintf(fout,"\n"); } void myRead() { if(fout!=NULL) {fclose(fout); fout=NULL;} if(fin==NULL) fin=fopen("file.txt","r"); for(int i=0;i<20;i++) { fscanf(fin,"%f",&angle[i]); } glutPostRedisplay(); } void keyBoard(unsigned char key,int x,int y) { if(key=='r') myRead(); if(key=='0') angleID=0; if(key=='1') angleID=1; if(key=='2') angleID=2; if(key=='3') angleID=3; } void mouse(int button,int state,int x,int y) { oldx=x; } void motion(int x,int y) { angle[angleID]+=(x-oldx);///改變量質 myWrite(); oldx=x; glutPostRedisplay();///重畫畫面 } void display() { glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); ///畫圖前,清畫面 glColor3f(1,1,1);///白色的 glRectf(0.3,0.5,-0.3,-0.5); glPushMatrix();///右半邊 glTranslatef(0.3,0.4,0);///將方塊掛回原來的地方 glRotatef(angle[0],0,0,1);///對z軸旋轉 glTranslatef(-0.3,-0.4,0);///將方塊中心移到世界中心 glColor3f(1,0,0);///紅色 glRectf(0.3,0.5,0.7,0.3);///上手臂 glPushMatrix(); glTranslatef(0.7,0.4,0);///將方塊掛回原來的地方 glRotatef(angle[1],0,0,1);///對z軸旋轉 glTranslatef(-0.7,-0.4,0);///將方塊中心移到世界中心 glColor3f(0,1,0);///綠色 glRectf(0.7,0.5,1.0,0.3);///下手肘 glPopMatrix(); glPopMatrix(); glPushMatrix();///左半邊 glTranslatef(-0.3,0.4,0);///將方塊掛回原來的地方 glRotatef(angle[2],0,0,1);///對z軸旋轉 glTranslatef(0.3,-0.4,0);///將方塊中心移到世界中心 glColor3f(1,0,0);///紅色 glRectf(-0.3,0.5,-0.7,0.3);///上手臂 glPushMatrix(); glTranslatef(-0.7,0.4,0);///將方塊掛回原來的地方 glRotatef(angle[3],0,0,1);///對z軸旋轉 glTranslatef(0.7,-0.4,0);///將方塊中心移到世界中心 glColor3f(0,1,0);///綠色 glRectf(-0.7,0.5,-1.0,0.3);///下手肘 glPopMatrix(); glPopMatrix(); glutSwapBuffers(); ///畫好後,交換出來 } int main(int argc,char**argv) ///main()主函式進階版 { glutInit(&argc,argv); ///把參數給glutInit初始化 glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH); ///雙緩衝區,3D深度功能 glutCreateWindow("第13的程式"); ///開啟GLUT視窗 glutMouseFunc(mouse); glutMotionFunc(motion); glutKeyboardFunc(keyBoard); glutDisplayFunc(display); ///用來顯示函式 glutMainLoop(); }