Understanding argc and argv in C Programming
Learn about the argc and argv parameters in C programming with examples and explanations provided by Yung-Hsiang Lu from Purdue University. This tutorial covers the basics of using argc and argv in C programs, including how to access command-line arguments and their importance in program execution.
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Understand argc and argv Yung-Hsiang Lu Purdue University 1
#include <stdio.h> #include <stdlib.h> int main(int argc, char * * argv) { int ind; printf("argc = %d\n", argc); for (ind = 0; ind < argc; ind ++) { printf("argv[%d] = %s\n", ind, argv[ind]); } return EXIT_SUCCESS; } 2
#include <stdio.h> #include <stdlib.h> int main(int argc, char * * argv) { int ind; printf("argc = %d\n", argc); for (ind = 0; ind < argc; ind ++) { printf("argv[%d] = %s\n", ind, argv[ind]); } return EXIT_SUCCESS; } an integer as indexes 3
#include <stdio.h> #include <stdlib.h> int main(int argc, char * * argv) { int ind; printf("argc = %d\n", argc); for (ind = 0; ind < argc; ind ++) { printf("argv[%d] = %s\n", ind, argv[ind]); } return EXIT_SUCCESS; } %d means the value of an integer This line prints argc's value 4
#include <stdio.h> #include <stdlib.h> int main(int argc, char * * argv) { int ind; printf("argc = %d\n", argc); for (ind = 0; ind < argc; ind ++) { printf("argv[%d] = %s\n", ind, argv[ind]); } return EXIT_SUCCESS; } argc is the number of arguments it is at least one 5
#include <stdio.h> #include <stdlib.h> int main(int argc, char * * argv) { int ind; printf("argc = %d\n", argc); for (ind = 0; ind < argc; ind ++) { printf("argv[%d] = %s\n", ind, argv[ind]); } return EXIT_SUCCESS; } the first argument is the program's name 6
#include <stdio.h> #include <stdlib.h> int main(int argc, char * * argv) { int ind; printf("argc = %d\n", argc); for (ind = 0; ind < argc; ind ++) { printf("argv[%d] = %s\n", ind, argv[ind]); } return EXIT_SUCCESS; } ind is 0, 1, 2, ... argc - 1 7
#include <stdio.h> #include <stdlib.h> int main(int argc, char * * argv) { int ind; printf("argc = %d\n", argc); for (ind = 0; ind < argc; ind ++) { printf("argv[%d] = %s\n", ind, argv[ind]); } return EXIT_SUCCESS; } print the index and the value of the argument 8
#include <stdio.h> #include <stdlib.h> int main(int argc, char * * argv) { int ind; printf("argc = %d\n", argc); for (ind = 0; ind < argc; ind ++) { printf("argv[%d] = %s\n", ind, argv[ind]); } return EXIT_SUCCESS; } print an integer 9
#include <stdio.h> #include <stdlib.h> int main(int argc, char * * argv) { int ind; printf("argc = %d\n", argc); for (ind = 0; ind < argc; ind ++) { printf("argv[%d] = %s\n", ind, argv[ind]); } return EXIT_SUCCESS; } print a string 10
#include <stdio.h> #include <stdlib.h> int main(int argc, char * * argv) { int ind; printf("argc = %d\n", argc); for (ind = 0; ind < argc; ind ++) { printf("argv[%d] = %s\n", ind, argv[ind]); } return EXIT_SUCCESS; } ind is 0, 1, 2, ..., argc - 1 not not 1, 2, ..., argc 11
