Question

我是C的新手。请问你能帮帮我吗。有一个结构名字，姓氏，性别，年龄。必须从键盘输入条目。我需要将这些信息保存在一个文件中，然后在屏幕上显示所有带有gender == Male的条目，并将它们保存在一个单独的文件中。谢谢！

有一个从文件中读取结构的代码，但我无法理解如何检查性别==男性。

#include "stdafx.h"
#include <cstdio>


int _tmain(int argc, _TCHAR* argv[])
{
    FILE *file;
    struct Person {
        char name[20]; 
        char gender[20]; 
        unsigned age; 
    };
    struct Person SinglePerson[10];
    char i=0;

    file = fopen("e:\\Test.txt", "r");

    while (fscanf (file, "%s%s%u", SinglePerson[i].name, &(SinglePerson[i].gender), &(SinglePerson[i].age)) != EOF) {
        printf("%s %s %u\n", SinglePerson[i].name, SinglePerson[i].gender, SinglePerson[i].age); 
        i++;
    }

    file = fopen("e:\\fprintf.txt", "w");

    while (scanf ("%s%s%u", SinglePerson[i].name, &(SinglePerson[i].gender), &(SinglePerson[i].age)) != EOF) {
        fprintf(file, "%s %s %u\n", SinglePerson[i].name, SinglePerson[i].gender, SinglePerson[i].age); 
        i++;
    }
    fread;

    return 0;
}

Answer 1

工作！我做到了））

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define M 2 // M plus 1 is equals to number of structres

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

    FILE *file;
    struct Person {
        char name[20]; 
        char gender[20]; 
        unsigned age; 
    };
    struct Person SinglePerson[1];
    char i=0;
    char counter = 0;

void InputFromKeyboard () {
    file = fopen("Input.txt", "w");
    while(scanf("%s%s%u", SinglePerson[i].name, SinglePerson[i].gender, &(SinglePerson[i].age)) == 3 && i <= M) {
        fprintf(file, "%s %s %u\n", SinglePerson[i].name, SinglePerson[i].gender, SinglePerson[i].age); 
        counter++;
        i++;
        if (i == M+1) {
            break;
        }
    }
    fclose(file);
};

void OutputToFile () {
    file = fopen("Output.txt", "w");
    for (i = 0; i < counter; i++) {
        if (strcmp(SinglePerson[i].gender, "Male") == 0) {
            fprintf(file, "%s %s %u\n", SinglePerson[i].name, SinglePerson[i].gender, SinglePerson[i].age); 
        }
    }
    fclose(file);
}

void OutputToScreen () {
    file = fopen("Output.txt", "r");
    for (i = 0; i < counter; i++) {
        if (strcmp(SinglePerson[i].gender, "Male") == 0) {
            printf("%s %s %u\n", SinglePerson[i].name, SinglePerson[i].gender, SinglePerson[i].age); 
        }
    }
    fclose(file);
}

int main(int argc, char *argv[]) {
    InputFromKeyboard();
    OutputToFile();
    OutputToScreen();
    return 0;
}

在C中显示屏幕上文件中的所有人

1 个答案: