11-07-2019
The empty line prints str1.
Because it was not matched in scanf() it has the value from the previous line - therefore the str1= assignment,
should set it to "" with one of
str1[0]=0 or str1[0]='\0' or with a bit more overhead strcpy(str1, "").
But you have str1[0]='0' that overwrites the first character of the previous value with a 0 character.
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LEARN ABOUT CENTOS
strneqvcmp
strneqvcmp(3) Programmer's Manual strneqvcmp(3)
NAME
strneqvcmp - compare two strings with an equivalence mapping
SYNOPSIS
#include <your-opts.h>
cc [...] -o outfile infile.c -lopts [...]
int strneqvcmp(char const* str1, char const* str2, int ct);
DESCRIPTION
Using a character mapping, two strings are compared for "equivalence". Each input character is mapped to a comparison character and the
mapped-to characters are compared for the two NUL terminated input strings. The comparison is limited to ct bytes. This function name is
mapped to option_strneqvcmp so as to not conflict with the POSIX name space.
str1 first string
str2 second string
ct compare length
RETURN VALUE
the difference between two differing characters
ERRORS
none checked. Caller responsible for seg faults.
SEE ALSO
The info documentation for the -lopts library.
ao_string_tokenize(3), configFileLoad(3), optionFileLoad(3), optionFindNextValue(3), optionFindValue(3), optionFree(3), optionGetValue(3),
optionLoadLine(3), optionMemberList(3), optionNextValue(3), optionOnlyUsage(3), optionProcess(3), optionRestore(3), optionSaveFile(3),
optionSaveState(3), optionUnloadNested(3), optionVersion(3), strequate(3), streqvcmp(3), streqvmap(3), strtransform(3),
2014-06-10 strneqvcmp(3)