String Copy Manual
Medium
C
Strings
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Problem Statement
strcpy() without using - copying character by character from source to destination including null terminator. Use pointer arithmetic.
Input Format
Two strings:
• source string
• destination string (enough space)
• source string
• destination string (enough space)
Output Format
Destination string after copying.
Example
Source: "hello"
Destination: "hello"
Constraints
• Destination must have enough space
• Copy must include null terminator ''
• Use pointer arithmetic only
• Copy must include null terminator ''
• Use pointer arithmetic only
Concept Explanation
Characters are copied one by one from source to destination using pointers, including the null terminator.
Step-by-Step Explanation
1.Create two pointers:
• src pointing to source string
• dest pointing to destination string
2.While the character pointed by src is not '':
• Copy *src to *dest.
• Increment both pointers (src++, dest++).
3.After loop ends, copy the null terminator:
• *dest = ''.
4.Destination string now contains the copied source string
• src pointing to source string
• dest pointing to destination string
2.While the character pointed by src is not '':
• Copy *src to *dest.
• Increment both pointers (src++, dest++).
3.After loop ends, copy the null terminator:
• *dest = ''.
4.Destination string now contains the copied source string
Concept Explanation
Characters are copied one by one from source to destination using pointers, including the null terminator.
Step-by-Step Explanation
1.Create two pointers:
• src pointing to source string
• dest pointing to destination string
2.While the character pointed by src is not '':
• Copy *src to *dest.
• Increment both pointers (src++, dest++).
3.After loop ends, copy the null terminator:
• *dest = ''.
4.Destination string now contains the copied source string
• src pointing to source string
• dest pointing to destination string
2.While the character pointed by src is not '':
• Copy *src to *dest.
• Increment both pointers (src++, dest++).
3.After loop ends, copy the null terminator:
• *dest = ''.
4.Destination string now contains the copied source string
Input / Output Format
Input Format
Two strings:
• source string
• destination string (enough space)
• source string
• destination string (enough space)
Output Format
Destination string after copying.
Constraints
• Destination must have enough space
• Copy must include null terminator ''
• Use pointer arithmetic only
• Copy must include null terminator ''
• Use pointer arithmetic only
Examples
Input:
Source: "hello"
Output:
Destination: "hello"
Example Solution (Public)
#include <stdio.h>
int main() {
char str[200];
int i;
int count = 0;
printf("Enter a sentence: ");
fgets(str, sizeof(str), stdin);
for (i = 0; str[i] != '�'; i++) {
// Word start condition
if (str[i] != ' ' &&
(i == 0 || str[i - 1] == ' ')) {
count++;
}
}
printf("Number of words = %dn", count);
return 0;
}
Official Solution Code
#include <stdio.h>
int main() {
char str[200];
int i;
int count = 0;
printf("Enter a sentence: ");
fgets(str, sizeof(str), stdin);
for (i = 0; str[i] != '�'; i++) {
// Word start condition
if (str[i] != ' ' &&
(i == 0 || str[i - 1] == ' ')) {
count++;
}
}
printf("Number of words = %dn", count);
return 0;
}
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