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  1. #include<stdio.h>
  2. #include<string.h>
  3. // Function to reverse a string
  4. void reverseString(char *str) {
  5.     int start = 0;
  6.     int end = strlen(str) - 1;
  7.     char temp;
  8.  
  9.     while (start < end) {
  10.         // Swap characters
  11.         temp = str[start];
  12.         str[start] = str[end];
  13.         str[end] = temp;
  14.  
  15.         // Move towards the middle
  16.         start++;
  17.         end--;
  18.     }
  19. }
  20. int main(){
  21.     char str1[100],str2[100];
  22.  
  23.     printf("enter string 1: ");
  24.     gets(str1);
  25.  
  26.     printf("enter string 2 : ");
  27.     gets(str2);
  28.  
  29.     strcpy(str1,str2);
  30.     printf("\nAfter strcpy(), str1: %s, str2: %s\n", str1,str2);
  31.  
  32.      reverseString(str1);
  33.     printf("\nAfter reverseString(), str1 reversed: %s\n", str1);
  34.     printf("Length of str2: %d\n",strlen(str2));
  35.  
  36.     if(strcmp(str1,str2)== 0)
  37.     printf("str1 and str2 are equal. \n");
  38.     else
  39.     printf("str1 and str2 are not equal. \n");
  40.  
  41.     strcat(str1,str2);
  42.     printf("After strcat(), str1: %s\n",str1);
  43.  
  44.     return 0;
  45. }
Success #stdin #stdout 0s 5284KB
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stdin
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Standard input is empty
stdout
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enter string 1: enter string 2 : 
After strcpy(), str1: , str2: 

After reverseString(), str1 reversed: 
Length of str2: 0
str1 and str2 are equal. 
After strcat(), str1:
https://ideone.com/ZvNoq7
language:
C (gcc 8.3)
created:
7 days ago
visibility:
public

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