A program begins by calling the function main. There is no
prototype required for this. It can be defined with no
parameters such as:
int main(void) { body...
}
Or with the following two parameters:
int main(int argc, char *argv[]) {
body... }
Note that they do not have to be called argc
or argv, but this is the common naming
system.
argc is a nonnegative integer. If
argc is greater than zero, then the string pointed
to by argv[0] is the name of the program. If
argc is greater than one, then the strings
pointed to by argv[1] through
argv[argc-1] are the parameters passed to the program
by the system.
Example:
#include<stdio.h>
int main(int argc, char *argv[])
{
int loop;
if(argc>0)
printf("My program name is %s.\n",argv[0]);
if(argc>1)
{
for(loop=1;loop<argc;loop++)
printf("Parameter #%i is %s.\n",loop,argv[loop]);
}
}
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