c - 我打印结构信息的代码有什么问题？

Question

#include <stdio.h>
#include <conio.h>
#include <windows.h>
#include <ctype.h>

struct ALUMNO{
    int cod;
    char nombre[20], grupo[3], app[20], apm[20];
    float prom,cali[5];
} al[20]={'\0'};

void gotoxy(int x,int y){
    HANDLE hcon;
    hcon = GetStdHandle(STD_OUTPUT_HANDLE);
    COORD dwPos;
    dwPos.X = x;
    dwPos.Y= y;
    SetConsoleCursorPosition(hcon,dwPos);
}

int main()
{
    char gru[3];
    int x = 0, sw, ac;
    al[0].cod=12345;
    strcpy(al[0].grupo,"1A");
    strcpy(al[0].nombre,"Erick");
    strcpy(al[0].app,"Medina");
    strcpy(al[0].apm,"Ramirez");
    al[0].prom=0.0;

    al[1].cod=12346;
    strcpy(al[1].grupo,"1A");
    strcpy(al[1].nombre,"Emmanuel");
    strcpy(al[1].app,"Sauceda");
    strcpy(al[1].apm,"Perez");
    al[1].prom=0.0;

    al[2].cod=12347;
    strcpy(al[2].grupo,"1B");
    strcpy(al[2].nombre,"Vincio");
    strcpy(al[2].app,"Lopez");
    strcpy(al[2].apm,"Martinez");
    al[2].prom=0.0;
    //salon B
    al[3].cod=12348;
    strcpy(al[3].grupo,"1B");
    strcpy(al[3].nombre,"Bryan");
    strcpy(al[3].app,"Osuna");
    strcpy(al[3].apm,"Beltran");
    al[3].prom=0.0;

    al[4].cod=12349;
    strcpy(al[4].grupo,"1C");
    strcpy(al[4].nombre,"Fullano");
    strcpy(al[4].app,"Mangano");
    strcpy(al[4].apm,"Centenario");
    al[4].prom=0.0;

    al[5].cod=12350;
    strcpy(al[5].grupo,"1C");
    strcpy(al[5].nombre,"Chapo");
    strcpy(al[5].app,"Guzman");
    strcpy(al[5].apm,"Loera");
    al[5].prom=0.0;
    //done

    printf("Grupo: ");
    scanf("%s",&gru);
    gru[1]=toupper(gru[1]);
    system("cls");
    printf("Codigo\tAp.paterno\tap.materno\tnombre\tpromedio");
    for (x=0, sw=0; x<25 && al[x].cod!=0; x++){
        if (strcmp(gru,al[x].grupo)==0){
            sw=1;
            ac++;
        }
        if (sw==1){
            gotoxy(1,ac);
            printf("%i",al[x].cod);
            gotoxy(12,ac);
            printf("%s",al[x].app);
            gotoxy(30,ac);
            printf("%s",al[x].apm);
            gotoxy(50,ac);
            printf("%s",al[x].nombre);
            gotoxy(60,ac);
            printf("%.2f",al[x].prom);
        }
    }
    ac=0;
}

出于某种原因，当您输入正确的组并按 Enter 键时，它会将母亲的姓氏打印在其他姓氏之上。或者某些名称可能丢失，或者这只是我的编译器。当每个组只有一个名称时，它可以正常工作。

Answer 1

您的gru变量在scanf中使用错误。应该是 gru，而不是 &gru。

顺便说一句，不要使用scanf，使用fgets