Getting Started tutorial two

Input and output

If you know watched yesterday's lesson, then you should be fluent in integer input and output, so if I want to enter the characters how should we do?

After the query data, we know that define the character, we use char, when to enter characters, we use%c

Now let's try to enter a, and use %dthe output.

#include <stdio.h>
int main ()
{
    char a;
    scanf("%c",&a);
    printf("%c\n",a);
    return 0;
}

OUTPUT

a
97

We can see
when we enter athe time of output is 97
when we enter is bwhen the output is 98
bin athe back, while bjust more than alarge 1, this should not be a coincidence.

Summary We experimentally obtained
letter | output value
| --- | --- |
| A | 97 |
| B | 98 |
| C | 99 |
| D | 100 |

So we boldly guess, the input after a +1, you can output b is not it?

#include <stdio.h>
int main ()
{
    char a;
    scanf("%c",&a);
    printf("%c\n",a+1);
    return 0;
}

OUTPUT

a
b

After verification, we can find our guess is right, let's try it enter capital letters.

#include <stdio.h>
int main ()
{
    char a;
    scanf("%c",&a);
    printf("%d\n",a);
    return 0;
}

OUTPUT

A
65

We can get through summary trials
letter | output value
| --- | --- |
| A | 65 |
| B | 66 |

It is not difficult to guess, to -32 lowercase letters, uppercase letters can be output.

#include <stdio.h>
int main ()
{
    char a;
    scanf("%c",&a);
    printf("%c\n",a-32);
    return 0;
}

OUTPUT

a
A

Learn who you should have learned basic input and output characters, and doing simple processing, if you want to know more things can go [Baidu Encyclopedia] [1] see.
[. 1]: https://baike.baidu.com/item/ASCII/309296?fr=aladdin