Question

In the program written below how i can ensure that only integer value is entered? And if character is entered the program should convert it to its ASCII equivalent and then add them and show output as number. Please help me......

#include<stdio.h>
int main(int argc, char **argv)
{
 int a,b,c;
 printf("enter two numbers:-");
 scanf("%d 	 %d",&a,&b);
 c=a+b;
 printf("addition of numbers= %d",c);
}

Answer 1

归还它成功读到的物品数量,以便你能够检查,确保它能够退回到你预期的同样数量。例如,

if (scanf("%d 	 %d", &a, &b) != 2)
{
    // handle error
}

注:是一种白色空间特性,而白空间被<代码>scanf忽略。

Answer 2

仅补充詹姆斯所说的话。

Dontabes

#include<stdio.h>
int main(int argc, char **argv)
{
 int a,b,c;

 printf("enter two numbers:-");
 if( scanf("%d 	 %d",&a,&b)  == 2 )
 {
    c=a+b;
     printf("addition of numbers= %d",c);
 }
 else {
        printf("please enter a valid input");
        getchar(); // the getchar will clear the stdin otherwise next time you go do 
                   // a scanf it might not work. 
    }
}

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