Prints a textual description of the error code currently stored in the system variableerrno tostderr.

The description is formed by concatenating the following components:

• the contents of the null-terminated byte string pointed to bys, followed by": " (unlesss is a null pointer or the character pointed to bys is the null character)
• implementation-defined error message string describing the error code stored inerrno, followed by'\n'. The error message string is identical to the result ofstrerror(errno).

[edit]Parameters

[edit]Return value

(none)

[edit]Example

#include <stdio.h> int main(void){FILE*f=fopen("non_existent","r");if(f==NULL){        perror("fopen() failed");}else{fclose(f);}}

fopen() failed: No such file or directory

[edit]References

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