Question

Write a program to swap adjacent characters of a string

Answer 1

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Program to swap adjacent characters of a string in C



/** C program to swap adjacent characters * of a string but obly if it is of even * length */ #include <stdio.h> #include <string.h> // main function int main() { // Declare an integer pointer char string[30]={0}; char c=0; int length=0,i=0; // Take string input from the user printf("\nEnter the string : "); fgest(string,30,stdin);//gets(string); // calculate the length of the string length = strlen(string); if(length%2==0) { for(i=0;i<length;i+=2) { c = string[i] ; string[i] = string[i+1]; string[i+1] = c; } printf("\nAfter Swap String : %s",string); } else { printf("\nThe length of the string is Odd..\n"); } return 0; }

Output

Run 1: Enter the string : help After Swap String : ehpl
Run 2: Enter the string : program The length of the string is Odd.. 

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