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Explain command line arguments of main function in C?

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asked Jan 8, 2014 by sara Guru (24,570 points)

1 Answer

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In C, we can supply arguments to 'main' function. The arguments that we pass to main ( ) at command prompt are called command line arguments. These arguments are supplied at the time of invoking the program.The main ( ) function can take arguments as: main(int argc, char *argv[]) { } The first argument argc is known as 'argument counter'. It represents the number of arguments in the  command line. The second argument argv is known as 'argument vector'. It is an array of char type pointers that  points tothe command line arguments. Size of this array will be equal to the value of argc.

Example: at the command prompt if we give:

C:\> fruit.exe apple mango

Then argc would contain value 3 argv [0] would contain base address of string " fruit.exe" which is the command name that invokes the program.

argv [1] would contain base address of string "apple"

argv [2] would contain base address of string "mango"

here apple and mango are the arguments passed to the program fruit.exe

Program:

#include <stdio.h>

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

int n;

printf("Following are the arguments entered in the command line");

for (n = 0; n < argc; n++) {

printf("\n %s", argv[n]);

}

printf("\n Number of arguments entered are\n %d\n", argc);

return 0;

}

Output:

Following are the arguments entered in the command line

C:\testproject.exe

apple

mango

Number of arguments entered are

3
answered Jan 8, 2014 by rajesh Guru (39,140 points)

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