LAD Week12_檔案讀寫

桌面開起檔案

 #include <stdio.h>

int main()

{//fout 檔案指標

    FILE*fout=fopen("file.txt","w");//檔名，模式

    printf("Hello World\n");//W:write

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

}

會在桌面跳出新的檔案(file.txt))

讀取桌面檔案

#include <stdio.h>

int main()

{

    char line[20];

    FILE*fin=fopen("file.txt","r");r=rade

    fscanf(fin,"%s",line);

    printf("讀到了:%s\n",line);//馬上印

    fscanf(fin,"%s",line);

    printf("讀到了:%s\n",line);//馬上印

}

開關檔案

#include <stdio.h>

int main()

{

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

    FILE*fout=fopen("file3.txt","w");

    for(int i=0;i<10;i++){

        fprintf(fout,"%d ",a[i]);//寫入檔案

        printf("%d ",a[i]);//同時印出

    }

    fclose(fout);

    int b[10];

    FILE*fin=fopen("file3.txt","r");

    for(int i=0;i<10;i++){

        fscanf(fin,"%d",&b[i]);//讀入陣列b[i]中

        printf("%d ",b[i]);

    }

    fclose(fin);

}

滑鼠控制位置同時解決讀檔問題

#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)

{

    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();

}

滑鼠寫檔鍵盤觸發讀檔

#include <stdio.h>

#include <GL/glut.h>

float teapotX=0,teapotY=0;

FILE*fout=NULL;

FILE*fin=NULL;

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)

{

    teapotX=(x-150)/150.0;

    teapotY=(150-y)/150.0;

    if(state==GLUT_DOWN){

        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");

    }

    display();

}

int main(int argc,char**argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week12");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    glutMouseFunc(mouse);

    glutMainLoop();

}

解決歷史遺毒

1.CTRL+Shift+S先存檔

2.對著圖示按右鍵-Properties按Build Target

3.將工作執行目錄改成句點(.)

4.將freeglut.all放回專案檔中