write a program to convert asci to integers using command line in c- ATOI

Using ATOI in C: Convert ASCII to Integers via Command Line

To write a C program to convert ASCII to integers using the command line in C - ATOI, we can use the following steps:

Include the necessary header files:

#include <stdio.h>
#include <stdlib.h>

Declare a function to convert ASCII to integers:

int atoi(const char *str) {
  int result = 0;
  while (*str != '\0') {
    result = result * 10 + (*str - '0');
    str++;
  }
  return result;
}

Write the main function to accept the ASCII string from the command line and convert it to an integer:

int main(int argc, char *argv[]) {
  if (argc != 2) {
    printf("Usage: %s <ASCII string>\n", argv[0]);
    return 1;
  }

  int integer = atoi(argv[1]);
  printf("The integer value of the ASCII string is: %d\n", integer);

  return 0;
}

Compile and run the program:

$ gcc -o atoi atoi.c
$ ./atoi 123
The integer value of the ASCII string is: 123

This program can be used to convert any ASCII string that represents a valid integer to an integer value.

Further Reading:

What is command line arguments? What is the use of that?

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