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Command line arguments in c language

Hey Folks!

                In this blog i would like to give you some ideas about command line arguments in c language. Its actually easy and it will be very interesting to write a program in command line arguments.

Is command line argument is that much important?

               Yes, Recently while going through the top MNC's preliminary round which include a coding round where most of the questions' i.e, 75% of questions are write a program using command line arguments in  c language. Especially TCS, Capgemni, CTS, and some other companies are looking for the candidate whoever good at writing a good code with excellent logics and added to that their ability to write the code getting the input as command line arguments .

               From 2018 they have updated their questions pattern for the first round. For the past few year they have focus  on only the general aptitude round includes questions for testing verbal ability, Quantitative aptitude , Logical reasoning , and at last the programming test will be there for the people who are going to appear in up coming drive for Top MNCs' .

COMMAND LINE ARGUMENTS           

            To start write code with main as:
                                             
                                        int main( int argc, char* argv[])
                                                  {
                                                    //code
                                                         }


      Thinks to remember:

  •   .Arguments values starts from the array index of 1             argv[1]  
  •   Array index 0 contains the program name or file name.      argv[0]
  •    argv[argc] is a null pointer.
  •   atoi() is a method to use convert string into integer  eg: atoi(argv[2]);
  •  atoi() function will be available in the header stdlib . 
  •   argc      --------------   argument count
  •    argv[]   --------------   array of values
  • *argv[] --------------   Pointers, contains location of all the arguments

Here some sample programs using command line arguments which have been asking in many companies.



ADDITION OF TWO NUMBERS:

#include <stdio.h>

#include<stdlib.h>

int main(int argc, char* argv[])
{

int a,b,c;

a=atoi(a[1]);

b=atoi(b[2]);

c= a*b;

printf("%d",c);

  return 0;
}

AREA OF CIRCLE:

#include <stdio.h>

#include<stdlib.h>


int main(int argc, char* argv[])

{

int r;

float a;

r=atoi(argv[1]);

 a= 3.14*r*r;

printf("%.2f",a);

return 0;

}


FACTORIAL OF A NUMBER:

#include <stdio.h>

#include<stdlib.h>


int main(int argc, char* argv[])

{

 long f;

int n,i;

 n=atoi(argv[1]);

f=1;

for(i=1;i<=n;i++)

f=f*i;

printf("%ld",f);

 return 0;
}

FIBONACCI SERIES:

#include <stdio.h>

#include<stdlib.h>


int main(int argc, char* argv[])

{
 int n;

 int a,b,c,i;

  n=atoi(argv[1]);

 a=-1;

 b=1;

   for(i=1;i<=n;i++)

   {

          c=a+b;

        printf("%d\t",c);

        a=b;

         b=c;

         }

return 0;
}

HYPOTENOUS:

#include <stdio.h>

#include<stdlib.h>

#include<math.h>

int main(int argc, char* argv[])

{

 double hyp,opp,adj;
   
 opp=atoi(argv[1]);
   
 adj=atoi(argv[2]);
    
opp*=opp;
    
adj*=adj;
   
 hyp=sqrt(opp+adj);
    
printf("%lf\t",hyp);
        
return 0;
}


SQUARE OF A NUMBER:

#include <stdio.h>

#include<stdlib.h>

#include<math.h>

int main(int argc, char* argv[])

{
 int a,sq;

 a=atoi(argv[1]);

 sq= a*a;
printf("%d",sq);
return(0);

}

PRIME NUMBER:

#include <stdio.h>

#include<stdlib.h>

#include<math.h>

int main(int argc, char* argv[])

{
 int n;
int f=0,i;
n=atoi(argv[1]);

   for(i=2;i<=sqrt(n);i++)
  
{ 
if(n%i==0)
  
 f=1;

   break;

  }

   if(f==0)
   
printf("the given number %d is prime",n);
   
else
   
printf("the given number %d is not a prime",n);
    
return(0);
}

LEAP YEAR:

#include <stdio.h>

#include<stdlib.h>

#include<math.h>

int main(int argc, char* argv[])

{
 int n;
 n=atoi(argv[1]);

 if(n%4==0)
  
printf("the given year %d is leap year",n);
  
else
  
printf("the given year %d is not a leap year",n);
    return(0);

}

AMSTRONG NUMBER:

#include <stdio.h>

#include<stdlib.h>

#include<math.h>

int main(int argc, char* argv[])

{

 int n,m,s,r;
n=atoi(argv[1]);
m=n;

 s=0;
while(n!=0)

 {
    r=n%10;
  
   s=s+r*r*r;
    n=n/10;
     
   }
     
if(m==s)
     
printf("the given number %d is amstrong number",m);
     
else
     
printf("the given number %d is  not an amstrong number",m);
     
return(0);

}


ODD NUMBERS IN A DIGIT:


#include <stdio.h>

#include<stdlib.h>

#include<math.h>

int main(int argc, char* argv[])

{

 int n,m,r,c;
 n=atoi(argv[1]);

 m=n;
 c=0;
while(n!=0)

 {
  
   r=n%10;
     
if(r%2!=0)
     
c++;
     
n=n/10;
  
       }
     
     printf("the given number %d has %d odd numbers",m,c);
     
return(0);

}


PALINDROME OR NOT:

#include <stdio.h>

#include<stdlib.h>

#include<math.h>

int main(int argc, char* argv[])

{

 int n,m,s,r;
 n=atoi(argv[1]);
m=n;

 s=0;
while(n!=0)

 {
  r=n%10;
 s=s*10+r;
    n=n/10;
     
    }
     
if(m==s)
     
printf("the given number %d is palindrome",m);
     
else
     
printf("the given number %d is  not a palindrome",m);
     
return(0);
}

PROGRAM TO DISPLAY MULTIPLES OF 3 AND 4 IF COMMON DISPLAY *:

#include <stdio.h>

#include<stdlib.h>

int main(int argc, char* argv[])

{

 int i,n;
n=atoi(argv[1]);

 for(i=1;i<=n;i++)
if(i%3==0&&i%4==0)

    printf("*\t");
    
else if (i%3==0||i%4==0)
    
printf("%d\t",i);
    
return(0);

}

LENGTH OF STRING:

#include <stdio.h>

#include<stdlib.h>

int main(int argc, char* argv[])
{
int i,n;
char *c;

c=argv[1];
i=0;
n=0;
while(*c++!='\0')
  
             n++;

 printf("%d",n);
    
    return(0);
}

VOWELS CALCULATION IN  COMMAND LINE ARGUMENTS:

#include <stdio.h>

#include<stdlib.h>

int main(int argc, char* argv[])
{

 int i,n;
 char *c;

c=argv[1];
i=0;

 n=0;

 while(*c!='\0')
        {
     
            char x= tolower(*c++);
     
                 if(x=='a'||x=='e'||x=='i'||x=='o'||x=='u')
     
                  n++;
   
  
         }
printf("%d",n);
    
    return(0);


}


STRING REVERSE:

#include<stdio.h>

#include<string.h>

int main(int argc, char *argv[]) 
{
   
char temp;
  
 char *str;

   int i, j;
   /* Make sure correct command line arguments are passed */
  
 if(argc!=2)
{
      
 printf("Invalid Usage.\n");
       
printf("Usage Example: ./a.out string_to_reverse");
       
return 1;

   }
    
  
 str = argv[1]; // 2nd argument will the string to be reversed

   i = 0; // Initialize i at start 

   j = strlen(str) - 1; // Initialize j with end of string length
   /* Swap characters from start and end */
  while (i < j) 
{
    
  temp = str[i];
    
  str[i] = str[j];
   
   str[j] = temp;
     
 i++;
     
 j--;

   }
  
   
printf(str);
  
 return 0;

}

BIGGEST OF N NUMBERS:

#include<stdio.h>

#include<stdlib.h>

int main( int argc, char* argv[])

{ 
    
int arr[10];
    
int i,j;
    
int max;
   
 j-0;
  
  for(i=1;i<argc;i++)
    
       arr[j++]=atoi(argv[i]);
      max=arr[0];
    
for(i=0;i<j;i++)
    
if(arr[i]>max)
    
 max=arr[i];
   
    printf("%d",max);

  
 return 0;

}

LCM OF TWO NUMBERS:

#include<stdio.h>

#include<string.h>

#include<stdlib.h>

int main( int argc, char* argv[])

{ 
   
 int n1,n2,x,y;
  
if (argc == 1 || argc > 3)
 {
    
printf("Enter Two Number\r\n");
    
exit(0);
  
}

    x= atoi(argv[1]);
   
 y=atoi(argv[2]);
   
 n1=x;
  
  n2=y;
  
  while(n1!=n2)
   
 {
  
  if(n1>n2)
         n1=n1-n2;
    
else
   
       n2=n2-n1;
  
  }
    
printf("%d", x*y/n1);

  
 return 0;

}

AVERAGE OF GIVEN NUMBERS:

#include<stdio.h>

#include<stdlib.h>

int main( int argc, char* argv[])

{ 
int count;

float sum=0;

int i=1;
  
  if(argc==1)
    
{
      
  printf("enter two or more numbers to get average");
      
  exit(0);
  
  }
   count=argc-1;
   
 while(i<=count)
    
{
       
 sum+=atoi(argv[i++]);
   
 }

printf("%f",sum/count);
    
  
 return 0;

}

BINARY TO DECIMAL:

#include<stdio.h>

#include<math.h>

#include<stdlib.h>

int main(int argc, char* argv[])

{
 int count;
int n,s,i,r,temp;

 n=atoi(argv[1]);

 s=0;
i=0;
temp=n;
while(n!=0)

 {
  
   r=n%10;
     
   s=s+r*pow(2,i++);
     
   n=n/10;

 }

 printf("Decimal value of %d is :%d",temp,s );

return 0;

 }
    


TIPS TO GET EFFICIENT OUTPUT IN COMMAND LINE ARGUMENT:

condition 1:
 To know whether they have given input or not

if(argc==1)
{
printf(" You have not yet given the arguments just give the arguments");
return -1;//to exit
}
else
{
//Lines of code
}

condition 2: 
To check whether the given arguments exceeds limit or incorrect argument counts

 if(argc == 1 ||  argc > 2)
    {
         printf("Enter the number\n");
         exit(1);
    }
else
{
//Lines of code
}

Condition X:
Like wise before writing the logic for the given problem we can check the argument status in order to avoid the confusions and improper answers.


Here i have given a  piece information about Writing program using input of command line arguments in c . If there is any chaos with above code and logic , please mention it in the command section . Surely i will work for it to clear .







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