:/ week12

檔案讀寫 把 printf 改成 fprintf 就能寫檔案

 #include <stdio.h>

int main()

{

    FILE*fout=fopen("file.txt","w");

    printf("Hello World\n");

    fprintf(fout,"Hello World\n");///w:write

}

讀檔案

#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);

}

讀+寫

#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);

}

用滑鼠移動茶壺

#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();

}

加入鍵盤存檔

#include <stdio.h>

#include <GL/glut.h>

FILE*fout=NULL;

FILE*fin=NULL;

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");

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

    }

    display();

}

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

{

    if(fin==NULL){

        fclose(fout);

        fin=fopen("file4.txt","r");

    }

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

    display();

}

int main(int argc,char**argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week12");

    glutDisplayFunc(display);

    glutMouseFunc(mouse);

    glutKeyboardFunc(keyboard);

    glutMainLoop();

}