T week12

1.codeblock開新檔 empty file

#include <stdio.h>

int main()

{

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

    printf("Hello World\n");

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

}

2.codeblock開新檔 empty file

#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);

}

3.codeblock開新檔 empty file

#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);

}

4.開GLUT Project

#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();

}

茶壺會出現在你鼠標點擊的位置

5.修改

#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);

    glutMainLoop();

}