sheeba - week12 - 檔案讀寫

 Step01-1

在Codeblocks建立新專案   命名為week12-1_printf_fprintf.cpp

#include <stdio.h>
int main()
{
    FILE*fout=fopen("file.txt","w");
    printf("Hello World\n");
    fprintf(fout,"Hello World在檔案裡\n");
}

Step01-2

在Codeblocks建立新專案   命名為week12-2_printf_fprintf.cpp

#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);

}

Step01-3

在Codeblocks建立新專案   命名為 week12-3_many_numbers_scanf_printf_fscanf_fprintf.cpp

///week12-3

#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);

}

Step02-1

在Codeblocks建立GLUT專案   命名為week12-4_keyboard_mouse.cpp

使茶壺隨著滑鼠點擊移動

///week12-4_keyboard_mouse要用鍵盤滑鼠操控茶壺

#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();

}

Step02-2

修改程式碼   空白鍵可還原茶壺移動過的軌跡

///week12-4_keyboard_mouse要用鍵盤滑鼠操控茶壺

#include <stdio.h>

#include <GL/glut.h>

FILE * fout = NULL;///step02-2一開始檔案沒有開,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();

}

Step03-1

修改工作目錄   把bin裡的freeglut.dll複製到week12-4_keyboard_mouse資料夾裡