Among the C language types, common ones are: int, short, long, char, float, double, etc.
| type of data | Occupied bytes | printf function format | scanf function format | Replenish |
| int (integer) |
4 | printf("%d\n",a) %d signed decimal print %u unsigned decimal print %o unsigned octal print %x lowercase hexadecimal printing （ 0xbb） %X uppercase hexadecimal printing （0xBB） |
scanf("%d"，&a) | int, short, and long are all integer types, but the data length must follow: short<int<long |
| short (short integer) |
2 | printf("%hd",b); | scanf("%hd",b); | ditto |
| long (long integer) |
4 (under window) |
printf("%ld",c); | scanf("%ld",c); | ditto |
| char (character) |
1 | char d='D' char ch="abc"(string) printf("%d",d) is to print the corresponding ASCLL code value printf("%c",d) is to print the corresponding string |
scanf("%c",d); | ASCLL code value of null character = 32 Then: lowercase to uppercase printf("%c",'a'-' ') uppercase to lowercase printf("%c",'A'+' ') Common ASCLL code values: 0->48 A->65 a->97 |
| float (single precision floating point) |
4 | Assignment method: float a=3.14f; or a=3.2e3f(3.2*1000) a=3.2e-2f(3.2*0.01) printf("%f",a); |
scanf("%f",a); | %f 默认保留小数点后六位 %.2f 保留小数点后两位而且会四舍五入 |
| double (双精度浮点型) |
8 | double b=3.14; printf("%lf\n",b); |
scanf("%lf",b); |
以上是学习的笔记，跟着B站的黑马程序员进行学习的，为了C语言计算机二级考试。
一字一敲，有错误，谢谢大佬的指点！