分割故障时scanf函数来strucs阵列（更正） [英] Segmentation fault when scanf to array of strucs (CORRECTED)

问题描述

这学生管理的典型例子是让我疯了
我必须要完成scanf函数，以结构的数组
第一scanf函数后，我得到分段错误。
林几乎可以肯定我需要的东西的malloc
但香港专业教育学院一直与这个努力从昨天起，我真的需要帮助
在％d个scanf函数的问题是我的错误编辑程序，它张贴在这里..
现在，我设法将它张贴完整。

 的#include＆LT;＆stdio.h中GT;
＃包括LT＆;＆stdlib.h中GT;
＃包括LT＆;＆CONIO.H GT;
＃包括LT＆;＆stdio.h中GT;const int的cantidadalumnos = 50;
const int的cantidadmaterias = 300;
结构AlumnoData
{
    INT帕德龙;
    INT DNI;
    炭apellido [20];
    炭nombres [20];
    INT EDAD;
    烧焦DIR [30];
    炭localidad [20];
    焦炭省报[20];
    INT ingreso;
    INT codcar;
};
结构MateriaData
{
    INT codmat;
    焦炭本草[20];
    INT anio;
    INT cuat;
    INT numcurso [20];
    INT诺塔;
    INT LIBRO;
    INT对开;
};
诠释的main（）
{
    INT indicealumno;
    indicealumno = 0;
    INT indicemateria;
    结构AlumnoData alumno [cantidadalumnos]
    结构MateriaData本草[cantidadmaterias]
    焦炭opcion;
    INT intop;
    做
    {
        的printf（\\ n \\ n \\ n \\ n \\ n \\ n \\ #####拥塞德alumnos ##### \\ N / / / / / / / / / / / / / / /）;
        的printf（\\ n 1. Ingresar alumno）;
        的printf（\\ n 2. Buscar联合国alumno POR帕德龙）;
        opcion =残培（）;
        intop = opcion;
        开关（intop）
        {
        情况1' ：
            的printf（------------- INGRESO DE ALUMNO \\ n --------------------------- \\ n ）;            为（indicealumno = 0; indicealumno＆下; cantidadalumnos; indicealumno ++）
            {
                的printf（香格里拉cantidad德alumnos闪现埃尔时代报ES德％d个德％D，indicealumno，cantidadalumnos）;
                的printf（\\ nPadron：）;
                scanf函数（％D，alumno [indicealumno] .padron）;
                打破;
            };
            打破;
        }
    }
    而（opcion = 27！）;
}
 

解决方案

的％d个格式字符串用于读取 INT ，但你想读的字符串的。尝试改变格式字符串到正确的％S 来代替。请注意，我还包含一个的宽度的说明，以避免输入缓冲区溢出。

  scanf函数（％19秒，alumno [stdindex]。名称）;
 

修改更新的问题：

的 scanf（）的函数需要要接收值的变量的地址。允许函数修改的变量的内容。在那里你读帕德龙价值线应该是：

  scanf函数（％d个，＆安培; alumno [indicealumno] .padron）;
 

请注意在＆放大器; 运算符的第二个参数之前添加（地址的）

This classic example of student management is making me crazy I have to accomplish scanf to an array of structs After the first scanf i get segmentation fault. Im almost sure i need to malloc something but ive been struggling with this since yesterday and i really need help The problem in the %d scanf was my mistake editing the program to post it here.. Now i managed to post it complete..

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

const int cantidadalumnos = 50;
const int cantidadmaterias = 300;
struct AlumnoData
{
    int padron;
    int dni;
    char apellido[20];
    char nombres[20];
    int edad;
    char dir[30];
    char localidad [20];
    char provincia [20];
    int ingreso;
    int codcar;
};
struct MateriaData
{
    int codmat;
    char Materia[20];
    int anio;
    int cuat;
    int numcurso [20];
    int nota;
    int libro;
    int folio;
};
int main()
{
    int indicealumno;
    indicealumno = 0;
    int indicemateria;
    struct AlumnoData alumno[cantidadalumnos];
    struct MateriaData materia [cantidadmaterias];
    char opcion;
    int intop;
    do
    {
        printf ("\n\n\n\n\n\n\#####      Gestion de alumnos      #####\n/ / / / / / / / / / / / / / /");
        printf ("\n  1. Ingresar alumno");
        printf ("\n  2. Buscar un alumno por padron");
        opcion = getch();
        intop = opcion;
        switch (intop)
        {
        case '1' :
            printf ("-------------INGRESO DE ALUMNO\n---------------------------\n");

            for (indicealumno = 0 ; indicealumno<cantidadalumnos; indicealumno++)
            {
                printf("La cantidad de alumnos hasta el momento es de %d de %d", indicealumno, cantidadalumnos);
                printf("\nPadron:");
                scanf("%d", alumno[indicealumno].padron);
                break;
            };
            break;
        }
    }
    while (opcion !=27);
}

解决方案

The %d format string is used to read an int but you are trying to read a character string. Try changing the format string to the correct %s instead. Note that I've also included a width specifier to avoid an input buffer overrun.

scanf("%19s", alumno[stdindex].name);

Edit for updated question:

The scanf() function needs the address of the variables that are to receive values. That allows the function to modify the variable's contents. The line where you read a padron value should be:

scanf("%d", &alumno[indicealumno].padron);

Note the & (address-of) operator added before the second parameter.

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