Question

我试图扫描来自终端的输入，并且试图扫描初始空白，但是程序只是跳过了它。我以前尝试在其他程序中使用此方法，但在新程序中不起作用。请帮助！！！

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

#define ADMIN_PASS "ABC123"
#define MAX_ARR_LEN 20
#define debug

void getinput(char inp[], int n);
void password(char passUser[]);

int main(void)
{      
    char passUser[MAX_ARR_LEN+1];
    int i=1;
    while (i==1)
    {
        password(passUser);
        printf("Try again?(1/0)>");
        scanf("%d",&i);
        if (i == 1)
        printf("\n");
    }
    return 0;
}

void getinput(char inp[], int n)
{
    scanf("%[^\n]c", &inp[n-1]);
    #ifdef debug
        printf("\nThe entered code in function>%s\n",inp);
        printf("The 1st character of entered code in function>%c\n",inp[0]);
    #endif
}

void password(char passUser[])
{
    char admin[MAX_ARR_LEN+1] = ADMIN_PASS;
    do
    {
        printf("\nPlease enter the Administrator password to Login:\n");
        getchar();
        getinput(passUser);
        #ifdef debug
            printf("\nThe input password in main is>%s\n", passUser);
            printf("The 1st character in main is>%c\n", passUser[0]);           
        #endif
        if (strcmp(passUser, admin) != 0)
        {
            printf("The password entered is incorrect, try again\n");
        }
    } while (!(strcmp(passUser, admin) == 0));   
}

Answer 1

您应该像这样通过fgets(inp, sizeof(ADMIN_PASS), stdin)传递字符串：

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

#define ADMIN_PASS "ABC123"
#define MAX_ARR_LEN 20
#define debug

void getinput(char * inp);
void password(char * passUser);

int main(void)
{
    char passUser[MAX_ARR_LEN+1];
    int i=1;
    while (i==1)
    {
        password(passUser);
        printf("Try again?(1/0)>");
        scanf("%d",&i);
        if (i == 1)
        printf("\n");
    }
    return 0;
}

void getinput(char * inp)
{
    fgets(inp, sizeof(ADMIN_PASS), stdin);
    #ifdef debug
        printf("\nThe entered code in function>%s\n",inp);
        printf("The 1st character of entered code in function>%c\n",inp[0]);
    #endif
}

void password(char * passUser)
{
    char admin[MAX_ARR_LEN+1] = ADMIN_PASS;
    do
    {
        printf("\nPlease enter the Administrator password to Login:\n");
        getinput(passUser);
        #ifdef debug
            printf("\nThe input password in main is>%s\n", passUser);
            printf("The 1st character in main is>%c\n", passUser[0]);
        #endif
        if (strcmp(passUser, admin) != 0)
        {
            printf("The password entered is incorrect, try again\n");
        }
    } while (!(strcmp(passUser, admin) == 0));
}

我删除了getchar()，并且函数getinput()的第二个参数导致它们无用。

尝试扫描输入时，getchar（）跳过第一个字符

1 个答案: