week12

 week12

之前學printf,改成fprintf

#include <stdio.h>

int main()

{

    FILE*fout=fopen("file.txt","w");

    printf("Hello World\n");

    fprintf(fout,"Hello World在檔案裡\n");

}

#include <stdio.h>

int main()

{

    FILE*fin=fopen("file.txt","r");

    char line[100];

    fscanf(fin,"%s",line);

    printf("從file.txt讀到了:%s\n",line);

    fscanf(fin,"%s",line);

    printf("從file.txt讀到了:%s\n",line);

}

#include <stdio.h>

int main()

{

    int a[10]={10,20,30,40,50,60,70,80,90,100};

    int b[10]={};

    FILE*fout=fopen("file3.txt","w");

    for(int i=0;i<10;i++){

        printf("%d ",a[i]);

        fprintf(fout,"%d ",a[i]);

    }

    printf("\n");

    fprintf(fout,"\n");

    fclose(fout);

    FILE*fin=fopen("file3.txt","r");

    for(int i=0;i<10;i++){

        fscanf(fin, "%d",&b[i]);

        printf("b%d:%d ",i,b[i]);

    }

    fclose(fin);

}

用滑鼠控制

#include <stdio.h>

#include <GL/glut.h>

float teapotX=0,teapotY=0;

void display()

{

    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glTranslatef(teapotX,teapotY,0);

        glutSolidTeapot( 0.3 );

    glPopMatrix();

    glutSwapBuffers();

}

void mouse(int button,int state,int x,int y)

{

    if(state==GLUT_DOWN){

        teapotX=(x-150)/150.0;

        teapotY=(150-y)/150.0;

    }

    display();

}

int main(int argc,char**argv)

{

        glutInit(&argc,argv);

        glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

        glutCreateWindow("week12");

        glutDisplayFunc(display);

        glutMouseFunc(mouse);

        glutMainLoop();

}

#include <stdio.h>

#include <GL/glut.h>

FILE * fout = NULL; ///一開始檔案沒開，設為NULL

FILE * fin = NULL; /// 讀檔用的指標

float teapotX=0, teapotY=0;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glTranslatef(teapotX, teapotY, 0);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

void mouse(int button, int state, int x, int y)

{

    if(state==GLUT_DOWN)

    {

        teapotX = (x-150)/150.0;

        teapotY = (150-y)/150.0;

        if(fout==NULL) fout = fopen("file4.txt", "w");

        ///沒開檔就

        fprintf(fout, "%f %f\n", teapotX, teapotY);

    }

    display();

}

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

{

    if(fin == NULL)///如果檔案還沒fopen()

    {

        fclose(fout); ///前面mouse會開fout指標，所以要

        fin = fopen("file4.txt", "r");

    }

    fscanf(fin, "%f %f", &teapotX, &teapotY); ///讀檔

    display(); ///重畫畫面

}

int main(int argc, char** argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week12");

    glutDisplayFunc(display);

    glutMouseFunc(mouse);

    glutKeyboardFunc(keyboard);

    glutMainLoop();

}