Tcs Command Line Program for String Reversal

October 22, 2020

String Reversal Program with Command Line Programming

It is highly advisable to go through Command Line Arguments Post before even looking at the code. Please study this for TCS and come back to this post later.

Here is the code for String Reversal Using Command Line Arguments

[code language=”cpp”]

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

int main(int argc, char *argv[])
{
   int k;
   char temp;
   int i,j=0;
   int strsize = 0;
   for (i=1; i<argc; i++) {
       strsize += strlen(argv[i]);
        if (argc > i+1)
            strsize++;
   }
   char *cmdstring;
   cmdstring = malloc(strsize);
   cmdstring[0] = '\0';
   for (k=1; k<argc; k++) {
        strcat(cmdstring, argv[k]);
        if (argc > k+1)
            strcat(cmdstring, " ");
   }
   i = 0;
   j = strlen(cmdstring) - 1;
   while (i < j) {
      temp = cmdstring[i];
      cmdstring[i] = cmdstring[j];
      cmdstring[j] = temp;
      i++;
      j--;
   }
   printf("\nReverse string is :%s", cmdstring);
   return(0);

}

[/code]

Input – abcde

Output – edcba

This code is for String Reversal Program with Command Line Programming with solutions.

Other TCS Coding Questions –

5 comments on “Tcs Command Line Program for String Reversal”


  • VISHNU

    m trying to reverse a string using command line argument but I don’t know why am I getting segmentation fault for this .

    #include
    #include
    #include

    int main(int argc, char *argv[]) {
    char *str = argv[1];
    char *rev;

    int i, j, k;

    for (i = 0; str[i] != ‘\0’; i++); {
    k = i – 1;
    }
    for (j = 0; j <= i – 1; j++) {
    rev[j] = str[k];
    k–;
    }
    printf("The reverse string is %s\n", rev);

    return 0;
    }


  • Rishabh

    #include
    #include
    int main(int argc, char *argv[])
    {
    char temp;
    char *str;
    int i,j;
    str=argv[1];
    i=0;
    j=strlen(str)-1;
    while(i<j)
    {
    temp=str[i];
    str[i]=str[j];
    str[j]=temp;
    i++;
    j–;
    }
    printf("Reversed string is: %s",str);
    return 0;
    }

    more easy way


  • Shahla

    // cpp program for string reversal
    #include
    using namespace std;

    int main(int argc, char *argv[])
    {
    string s=argv[1];

    reverse(s.begin(),s.end());

    cout<<s;

    return 0;
    }


  • avi gehlot

    main(int argc, char *argv[]){
    char temp;
    char *string
    int i, j;
    if(argc!=2){
    printf(“Invalid Usage.\n”);
    printf(“Usage Example: ./a.out string_to_reverse”);
    return 1;
    }
    str=argv[1];
    i=0;
    j=strlen(str)-1
    while(i<j){
    temp=str[i];
    str[i]=str[j];
    str[j]=temp;
    i++;
    j–;
    }
    print(str);
    return 0;

    }
    more simple this