Saturday, July 7, 2007
Implement the strcmp(str1, str2) function.
There are many ways one can implement the strcmp() function. Note that strcmp(str1,str2) returns a -ve number if str1 is alphabetically above str2, 0 if both are equal and +ve if str2 is alphabetically above str1.
Here are some C programs which implement the strcmp() function. This is also one of the most frequently asked interview questions. The prototype of strcmp() is
int strcmp( const char *string1, const char *string2 );
Here is some C code..
#include
int mystrcmp(const char *s1, const char *s2);
int main()
{
printf("\nstrcmp() = [%d]\n", mystrcmp("A","A"));
printf("\nstrcmp() = [%d]\n", mystrcmp("A","B"));
printf("\nstrcmp() = [%d]\n", mystrcmp("B","A"));
return(0);
}
int mystrcmp(const char *s1, const char *s2)
{
while (*s1==*s2)
{
if(*s1=='0円')
return(0);
s1++;
s2++;
}
return(*s1-*s2);
}
And here is the output...
strcmp() = [0]
strcmp() = [-1]
strcmp() = [1]
Here are some C programs which implement the strcmp() function. This is also one of the most frequently asked interview questions. The prototype of strcmp() is
int strcmp( const char *string1, const char *string2 );
Here is some C code..
#include
int mystrcmp(const char *s1, const char *s2);
int main()
{
printf("\nstrcmp() = [%d]\n", mystrcmp("A","A"));
printf("\nstrcmp() = [%d]\n", mystrcmp("A","B"));
printf("\nstrcmp() = [%d]\n", mystrcmp("B","A"));
return(0);
}
int mystrcmp(const char *s1, const char *s2)
{
while (*s1==*s2)
{
if(*s1=='0円')
return(0);
s1++;
s2++;
}
return(*s1-*s2);
}
And here is the output...
strcmp() = [0]
strcmp() = [-1]
strcmp() = [1]
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thanks...............
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Nop, this code doesn' t work is s1 is a prefix string of s2.
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Try this one for better understanding of how actual strcmp() works:
#include
#include
int main(void)
{
char string1[20], string2[20];
char substring[20], *ret;
int i=0,len=0, count=0;
puts("enter the stirng one to compare");
fgets(string1, sizeof(string1), stdin);
len = strlen(string1);
if(string1[len-1]=='\n')
string1[len-1]='0円';
puts("enter the stirng two to compare");
fgets(string2, sizeof(string2), stdin);
len = strlen(string2);
if(string2[len-1]=='\n')
string2[len-1]='0円';
if(strlen(string1)==strlen(string2))
{
for(i=0;string1[i]!='0円', string2[i]!='0円', i0)
printf("string2 is less than string1");
}
if(strlen(string1)0)
printf("string2 is less than string1");
}
if(strlen(string1)>strlen(string2))
{
for(i=0;string2[i]!='0円', i0)
printf("string2 is less than string1");
}
return 0;
}
Try this one for better understanding of how actual strcmp() works:
#include
#include
int main(void)
{
char string1[20], string2[20];
char substring[20], *ret;
int i=0,len=0, count=0;
puts("enter the stirng one to compare");
fgets(string1, sizeof(string1), stdin);
len = strlen(string1);
if(string1[len-1]=='\n')
string1[len-1]='0円';
puts("enter the stirng two to compare");
fgets(string2, sizeof(string2), stdin);
len = strlen(string2);
if(string2[len-1]=='\n')
string2[len-1]='0円';
if(strlen(string1)==strlen(string2))
{
for(i=0;string1[i]!='0円', string2[i]!='0円', i0)
printf("string2 is less than string1");
}
if(strlen(string1)0)
printf("string2 is less than string1");
}
if(strlen(string1)>strlen(string2))
{
for(i=0;string2[i]!='0円', i0)
printf("string2 is less than string1");
}
return 0;
}
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