擦 大哥 Week12 讀寫檔案

 Week12 讀寫檔案

第一步教讀檔

#include <stdio.h>

int main(){

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

    printf("Hello World\n");

    fprintf(fout,"Hello World in the File\n");

}

第二部"讀"檔

#include <stdio.h>

int main(){

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

    char line[100];

    fscanf(fin,"%s",line);

    printf("從檔案裡讀到：%s\n",line);

    fscanf(fin,"%s",line);

    printf("從檔案裡讀到：%s\n",line);

}

一起的 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);

}

#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();

}

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/n", &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();

}