The difference between fgets and scanf

the difference between fgets and scanf1. An example of testing using scanf:

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1. #include "stdio.h"
2. #include "string.h"
5. int main ()
6. {
7. Char name[10];
8. scanf ("%s", name);
10. puts (name);
13. return 0;
14. }

Compile and invoke the following:

Can see the second time, due to the input string length, resulting in abort

2, the same example of a fgets:

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1. #include "stdio.h"
2. #include "string.h"
5. int main ()
6. {
7. Char name[10];
8. Fgets (name, ten, stdin);
10. puts (name);
13. return 0;
14. }

Compile and invoke the following:

There is no case of abort like scanf, but a truncation of the string

3. Compare scanf and Fgets:

A) scanf does not restrict user input, resulting in the abort of the above test example

Fgets restricts the user's input, and then truncates the string, avoiding abort, but setting a buffer length value

b) scanf can be used such as scanf ("%d/%d", &x, &y) in such a way that the user only needs to enter 1/3 to get the values of x and Y respectively:

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1. #include "stdio.h"
4. int main ()
5. {
6. int x;
7. int y;
8. scanf ("%d/%d", &x, &y);
9. printf ("x value:%d, y value:%d\n", x, y);
11. return 0;
12. }

But fgets, in any case, can only read one variable at a time, and it can only be a string (after all, it's str!). ), as in the following form, compilation is not a pass:

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1. #include "stdio.h"
4. int main ()
5. {
6. int x;
7. Fgets (x, sizeof (x), stdin);
8. printf ("x value:%d", x);
10. return 0;
11. }

c) spaces in the string

When scanf receives a string with%s, it stops when it encounters a space. If you want to enter multiple words, you need to call scanf () multiple times

Fgets () directly receives spaces in a string

4. Summary

Due to some of the differences mentioned in 3, be aware of the situation when using scanf () and fgets ().

The difference between fgets and scanf