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Asked by Mohd Rayyan Last Modified
Answer 
You might be familiar with the following simple way to define the main function:
int main() {/* blah blah */}
but, the more general way to define main is as followsint main(int argc, char* argv[]) {/* blah blah */}
Suppose you compile this file into say a.out, and then if you execute the program from the terminal (command prompt) as follows> ./a.out Hello World
the words Hello, and World are called as command-line arguments, and a.out is the executable (or program).
When executed as mentiond above, the values of argc and argv that the main function recieves would be as follows:
argc gets a value of 3 (the length of the argv array)
argv[0] points to a string with contents "./a.out"
argv[1] points to a string with contents "Hello"
and argv[2] points to a string with contents "World"
Within the main function, you can program different behaviours depending on these variables.
Compile the following and execute it with different command-line arguments to see it in action:
read less#include <stdio.h>int main(int argc, char* argv[]) {int i = 0;for(i = 0; i < argc; i++)printf("%s\n", argv[i]);return 0;}
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