I summarized the origin of the names of standard functions that I encountered when I started learning C language. Knowing the origin will make it easier to remember the function. I'm glad if you can use it as a reference. Also, since this is my first article, I would be grateful if you could point out any points that cannot be reached. I will update it little by little when I feel like it. ^^;
I thought there were many types. When outputting only one character as standard, use putchar () instead of putc (). When inputting only one character as standard, use getchar () instead of getc (). See here for the differences between putc () and fputc, and getc () and fgetc (). I'm not sure. https://ja.wikipedia.org/wiki/Getc Also, use getch () (non-standard function) for input that does not use the Enter key.
| Function name | Rough function | Origin of the name |
|---|---|---|
| putchar() | Output only one character to standard output | put + character |
| puts() | Output string to standard output | put + string |
| printf() | Output string to standard output with formatting | print + format |
| fputc() | Output only one character to a file | file + print + character |
| putc() | Same as above | put + character |
| fputs() | Output string to file | file + put + string |
| fprintf() | Output string to file with formatting | file + print + format |
| Function name | Rough function | Origin of the name |
|---|---|---|
| getchar() | Input only one character from standard input | get + character |
| gets() | Enter a character string from standard input | get + string |
| scanf() | Enter a string with formatting from standard input | scan + format |
| fgetc() | Enter only one character from the file | file + get + character |
| getc() | Same as above | get + character |
| fgets() | Enter a string from a file | file + get + string |
| fscanf() | Enter a string from a file with formatting | file + scan + format |
・ The first f is "file" f → Output to file (putc is not included) ・ The f attached at the end is f of "format" → with format (such as% d) ・ C, char → character → character ・ S → string → character string
| Function name | Rough function | Origin of the name |
|---|---|---|
| sprintf() | Assign a string to a formatted array | string + print + format |
| strcpy() | Make a copy of the string | string + copy |
| strcat() | Add (combine) a string to the end | string + catenate |
| strlen() | Find the length of the string | string + length |
| strcmp() | Compare strings | string + compare |
| atoi() | Convert "character string" representing a numerical value to "numerical value" | ASCII + to + integer |
-Can be used not only for character strings (strings) but also for arrays in general. -Although there are similar functions such as memcpy (), the str system is personally easier to use.
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