1) write a subroutine fstrcat (char * s, char * t) to complete the function of the string handling function strcat,
2) write a subroutine fstrcpy (char * s, char * t) to complete the function of the string handling function strcpy,
3) write a subroutine FSTRCMP (char * s, char * t) to complete the function of the string handling function STRCMP,
4) write a subroutine fstrlen (char * s) to complete the function of the string handling function strlen,
5) main function function: from the keyboard input string, call the above four sub-models function, output sub function return values or content change of string,

CodePudding user response:

Char * fstrcat (char * s, char * t)
{
int i=0;
Char * temp=s;
Char * temp2=t;
While (* temp!='\ 0')
{
i++;
Temp++;
}
While (* temp2)
{
S [i++]=* temp2;
Temp2 + +;
}
S [I]='\ 0';
return s;
}

CodePudding user response:

For your reference

 
# include & lt; stdio.h> 
# include & lt; Stdlib. H> 

//string concatenation 
Char * fstrcat (char * s, char * t); 
//string copy 
Char * fstrcpy (char * s, char * t); 
//string comparison 
Int FSTRCMP (char * s, char * t); 
//the length of the string 
Int fstrlen (char * s); 

Int main () 
{
Int j, k; 
Char [100] s1 and s2 [100], s3 [100], s4 [100]; 
Char * p=s3. 
Char * q=s4; 
Printf (" \ n input the first string: "); 
The scanf (" % s ", s1); 
Printf (" \ n input the second string: "); 
The scanf (" % s ", s2); 

P=fstrcat (s1, s2); 
Printf (" \ n after joining together string: % s \ n ", p); 

Q=fstrcpy (s1 to s4); 
Printf (" \ n \ n copy after string: % s ", q); 

J=FSTRCMP (s1, s2); 
If (j==1) 
Printf (" [% s]] [% s \ n ", s1, s2); 
Else if (j==0) 
Printf (" [% s] with equal] [% s \ n ", s1, s2); 
The else 
Printf (" [% s] is smaller than] [% s \ n ", s1, s2); 

K=fstrlen (s1); 
Printf (" [% s] length is: % d \ n ", s1, k); 

return 0; 
} 

//string concatenation 
Char * fstrcat (char * s, char * t) 
{
Int I=0, j=0; 

While (s [I]!='\ 0') 
{
i++; 
} 
J=I; 
i=0; 
While (t [I]!='\ 0') 
{
S [j++] [i++]=t; 
} 
S [j]='\ 0'; 

return s; 
} 

//string copy 
Char * fstrcpy (char * s, char * t) 
{
int i=0; 

While (s [I]!='\ 0') 
{
T=s [I] [I]; 
i++; 
} 
T [I]='\ 0'; 

return t; 

} 
//string comparison 
Int FSTRCMP (char * s, char * t) 
{
int i=0; 
While (s [I]!='\ 0' & amp; & T [I]!='\ 0') 
{
If (s [I] & gt; [I] t) 
return 1; 
Else if (s==[I] t [I]) 
return 0; 
The else 
return -1; 
i++; 
} 
} 
//the length of the string 
Int fstrlen (char * s) 
{
int i=0; 

While (s [I]!='\ 0') 
{
i++; 
} 
return i; 
}