当我在运行时设置两个输入时，Scanf（）要求三个输入。 [英] Scanf() is asking for three inputs when I set two when run.

问题描述

#include< stdio.h>

#include< stdlib.h>



int main（）

{

printf（Hello world！\ n）;

printf（Tenno heika banzai !! \ n）;

printf（％d \ n，69）;

printf（输入你的名字\ n）;

char name [ 30];

scanf（％s，& name）;

printf（你的名字是：）;

printf （％s \ n，姓名）;

printf（输入你的年龄\ n）;

int age;

scanf（％d，& age）;

printf（你的年龄是：）;

printf（％d \ n，年龄）;

if（age> = 18）{printf（Grown Frau / Mann \ n）;}

if（age< 18）{printf（年轻的boi \ n）;}

printf（输入一个大号。\ n）;

int nummer;

scanf（％ld，& nummer）;

printf（ ％ld \ n，nummer）;

int a;

int b;

printf（插入第一个和第二个数字： \ n）;

scanf（％d \ n，& a）; ///应该只是两个输入//

scanf（ ％d \ n，& b）; ///还有另一个鬼输入///

printf（你选择％d和％d，a，b）;

返回0;

}



我尝试过：



#include< stdio.h>

#include< stdlib.h>



int main（）

{

printf（Hello world！\ n）;

printf（Tenno heika banzai !! \ n）;

printf（％d \ n，69）;

printf（输入你的名字\ n）;

char name [30];

scanf（％s，& name）;

printf（你的名字是： ）;

printf（％s \ n，姓名）;

printf（输入你的年龄\ n）;

int age;

scanf（％d，& age）;

printf（你的年龄是：）;

printf（％d \ n，年龄）;

if（age> = 18）{printf（Grown Frau / Mann \ n）;}

if（age< 18）{printf（Young boi \ n）;}

printf（输入一个大数字r.\\\
）;

int nummer;

scanf（％ld，& nummer）;

printf（ ％ld \ n，nummer）;

int a;

int b;

printf（插入第一个和第二个数字： \ n）;

scanf（％d％d \ n，& a& b）;

printf（你选择％d和％轻拍）;

返回0;

}

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

int main()
{
printf("Hello world!\n");
printf("Tenno heika banzai!!\n");
printf("%d\n",69);
printf("Enter your name\n");
char name[30];
scanf("%s",&name);
printf("Your name is:");
printf("%s\n",name);
printf("Enter your age\n");
int age;
scanf("%d",&age);
printf("Your age is: ");
printf("%d\n",age);
if(age>=18){printf("Grown Frau/Mann\n ");}
if(age<18){printf("Young boi\n");}
printf("Enter a big number.\n");
int nummer;
scanf("%ld",&nummer);
printf("%ld\n",nummer);
int a;
int b;
printf("Insert first and second number pls:\n");
scanf("%d\n",&a);///should be just two inputs//
scanf("%d\n",&b);///There was a another ghost input///
printf("You have chosen %d and %d",a,b);
return 0;
}

What I have tried:

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

int main()
{
printf("Hello world!\n");
printf("Tenno heika banzai!!\n");
printf("%d\n",69);
printf("Enter your name\n");
char name[30];
scanf("%s",&name);
printf("Your name is:");
printf("%s\n",name);
printf("Enter your age\n");
int age;
scanf("%d",&age);
printf("Your age is: ");
printf("%d\n",age);
if(age>=18){printf("Grown Frau/Mann\n ");}
if(age<18){printf("Young boi\n");}
printf("Enter a big number.\n");
int nummer;
scanf("%ld",&nummer);
printf("%ld\n",nummer);
int a;
int b;
printf("Insert first and second number pls:\n");
scanf("%d%d\n",&a&b);
printf("You have chosen %d and %d",a,b);
return 0;
}

推荐答案

简单：你告诉它了！

scanf 调用中的\ n告诉scanf忽略换行符之前的所有内容 - 但您已经使用了用户输入的换行符来终止第一行整数，所以它有点混乱。

你也不应该使用％ld来读取一个整数 - 没有空间来容纳一个长整数，并且在某些系统可能会给你带来不可预测的结果。



另外，作为一个初学者，不要试图将它们拼凑在一条线上：

Simple: you told it to!
The "\n" in your scanf call tells scanf to ignore everything up to a newline - but you've already used the newline the user entered to terminate the first integer, so it gets a little confused.
You also shouldn't use "%ld" to read into an integer - there isn't th space to fit a long integer in there, and on some systems that may give you unpredictable results.

Plus, as a beginner, don;t try to cram it all together on one line:

if(age>=18){printf("Grown Frau/Mann\n ");}

正确缩进：

Indent it properly:

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

int main()
    {
    printf("Hello world!\n");
    printf("Tenno heika banzai!!\n");
    printf("%d\n",69);
    printf("Enter your name\n");
    char name[30];
    scanf("%s",&name);
    printf("Your name is:");
    printf("%s\n",name);
    printf("Enter your age\n");
    int age;
    scanf("%d",&age);
    printf("Your age is: ");
    printf("%d\n",age);
    if(age>=18) 
        {
        printf("Grown Frau/Mann\n ");
        }
    if(age<18) 
        {
        printf("Young boi\n");
        }
    printf("Enter a big number.\n");
    int nummer;
    scanf("%d",&nummer);
    printf("%d\n",nummer);
    int a;
    int b;
    printf("Insert first and second number pls:\n");
    scanf("%d",&a);
    scanf("%d",&b);
    printf("You have chosen %d and %d",a,b);
    return 0;
    }

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