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#include <stdio.h> int main(int argc, char *argv[]) { int i; for (i = argc - 1;...

#include <stdio.h>

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

int i;

for (i = argc - 1; i > 0; i--)

printf("%s ", argv[i]);

printf("\n");

return 0;

}

can you explain this code in c and why use this function  

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Answer #1

Here is the answer for your question in C Programming Language

Kindly upvote if you find the answer helpful.

Explanation :

  • int main(int argc, char *argv[]) - 'main' - the function though which the compiler starts compilation and execution of a C code. Without main method C program doesn't work at all 'int' before main indicates the return type of the main() method to the compiler.It returns an integer after the method is executed.   
  • int argc - 'argc' is a variable, it contains number of arguments passed through the main method (i.e., arguments passed while compiling the code via command line). As is an number, its respective data type is 'int'.              
  • char* argv[] - It is an array of strings, each string is an argument passed to the main method (i.e., it is a collection of arguments passed via command line). The first string of this array would be the path of the current C file.
  • int i - Declaration of a varable named 'i' which is of type integer
  • for (i = argc - 1; i > 0; i--) - for loop that loops through (total number of arguments - 2) times (i.e (argc - 1) removes last element, and i > 0 doesn't reach 0th element, hence two elements from the array of arguments cannot be traced). It prints arguments from last to first as it is starting from last argument
  • printf("%s ", argv[i]); -Prints the value of argument string at ith position in tha array argv[], %s specifies that the argument passed to this printf method is a string.
  • printf("\n"); - After printing all the strings prints next line

NOTE : I have used dev-c++ to execute this code, in this compiler we can pass arguments via parameters option. By default the first parameter will be the path of the file, and the parameters we pass will be displayed via this program.

CODE :

#include <stdio.h>

/*
   int main(int argc, char *argv[]) - 'main' - the function though which the compiler starts
                                   compilation and execution of a C code.
                                   Without main method C program doesn't work at all
                                   'int' before main indicates the return type of the
                                   main() method to the compiler.
                                   It returns an integer after the method is executed                                  
   int argc - 'argc' is a variable, it contains number of arguments passed through the main method
               (i.e., arguments passed while compiling the code via command line)
               As is an number, its respective data type is 'int'
              
   char* argv[] - It is an array of strings, each string is an argument passed to the main method
                   (i.e., it is a collection of arguments passed via command line)
                   The first string of this array would be the path of the current C file
*/
int main(int argc, char *argv[]) {
   //int i - Declaration of a varable named 'i' which is of type integer
   int i;  
  
   /*for loop that loops through (total number of arguments - 2) times (i.e
       (argc - 1) removes last element, and i > 0 doesn't reach 0th element,
       hence two elements from the array of arguments cannot be traced)

It prints arguments from last to first as is starting from last argument
   */
   for (i = argc - 1; i > 0; i--)  
      
       //Prints the value of argument string at ith position in tha array argv[]
       // %s specifies that the argument passed to this printf method is a string
       printf("%s ", argv[i]);  
      
       //After printing all the strings prints next line
       printf("\n");  
      
   //Returns 0
   return 0;
}

SCREENSHOTS :

Please see the screenshots of the code below for the indentations of the code.

int arg 1 #include <stdio.h> 2 /*int main(int args, char *argv[]) - main - the function though which the compiler starts 3Passing parameters in dev-c++

C:\Users\.. vesktop\Sample.c-Dev-C++ 5.11 File Edit Search View Project Execute Tools Style Window Help Compile F9 TDM-GCC 4.

Parameters we pass here will be displayed by the program in reverse order of strings(Each word seperated by space is an argument)

Parameters x Parameters to pass to your program: Welcome To C Programming Host Application: OK X Cancel

OUTPUT :

Programming C To Welcome Process exited after 0.1324 seconds with return value o Press any key to continue . .

Any doubts regarding this can be explained with pleasure :)

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