Command line arguments in c example
(1)What will be output of
following c code?
#include<stdio.h>
int main(int count,char *argv[]){
int i=0;
for(i=0;i<count;i++)
printf("\n%s",argv[i]);
return 0;
}
//save file as arg.c
In command line
C:\tc\bin>arg c techno tips
Output:
c
techno
tips
(2) What will be output of
following c code?
#include<dos.h>
#include<stdio.h>
int main(){
printf("%d",_argc);
return 0;
}
//save file as countarg.c
In command line
C:\tc\bin>countarg a1 a2 b1 b2
(press enter)
Output:
5
Explanation:
Here _argc is
global identifier which has defined in dos.h.it count toal number of argument
in command line.
(3)Reverse any string while string is passed throw command
line?
Answer:
#include<string.h>
#include<stdio.h>
int main(int count,char *str[]){
printf("%s",strrev(str[1]));
return 0;
}
(4) What will be output following
c code?
#include<dos.h>
#include<stdio.h>
int main(){
int i=0;
for(i=0;i<_argc;i++)
printf("\n%s",_argv[i]);
return 0;
}
//save file as arg.c
In command line
C:\tc\bin>arg usa india japan
Output:
Usa
India
japan
Explanation:
Here _argc,_argv is global identifier which
has defined in dos.h._arg count total number of argument in command line while _argv is array of string which
store all the argument in command line.
(5) Write a c program to create
dos command type.
Answer:
#include <stdio.h>
int main(int count,char * argv[]){
int i;
FILE
*ptr;
char *str;
char ch;
if(count==1){
printf("The
syntax of the command is incorrect.\n");
}
for(i=1;i<cout;i++){
ptr=fopen(argv[i],"r");
if(ptr==NULL){
printf("The
system cannot find the file specified.");
if(count>2)
printf("\nError
occurred while procesing : %s.\n",argv[i]);
}
else{
if(count>2){
printf("%s\n\n",argv[i]);
}
while((ch=getc(ptr))!=-1)
printf("%c",ch);
}
fclose(ptr);
}
return 0;
}
Save the above
file as open.c, compile and execute the go to command mode (current working
directory) and write: open xy.c (xy.c any file present in that directory)
To run the open
command in all directories and drive you will have to give the path of current
working directory in command mode. Write:
C:tc\bin>PATH
c:\tc\bin
Now press enter
key. Now your open command will work in all directory and drive.
(6) Write a c program to create
dos command dir.
Answer:
#include<stdio.h>
#include<dos.h>
int main(int count,char *argv[]){
struct find_t q ;
int a;
if(count==1)
argv[1]="*.*";
a
= _dos_findfirst(argv[1],1,&q);
if(a==0){
while (!a){
printf("
%s\n", q.name);
a
= _dos_findnext(&q);
}
}
else{
printf("File not
found");
}
return 0;
}
Save the above
file as list.c, compile and execute the go to command mode (current working
directory) and write: list *.c
To run the list
command in all directories and drive you will have to give the path of current
working directory in command mode. Write:
C:tc\bin>PATH
c:\tc\bin
Now press enter
key. Now your list command will work in all directory and drive.
Image list
(7)How can we
display the entire environments vector by c program?
Answer:
#include<stdio.h>
int main(int count,char *arg[],char *argvect[]){
int i=0;
while(argvect[i]) {
printf("\n%s",argvect[i]);
i++;
}
return 0;
}
(8)Write a c
program which takes a string from command line with main function
has no parameter and convert the string in
uppercase?
Answer:
#include<dos.h>
#include<string.h>
#include<stdio.h>
int main(){
char str[15];
int i=0;
strcpy(str,_argv[1]);
for(i=0;i<=strlen(str);i++){
if(str[i]>=97&&str[i]<=122)
str[i]=str[i]-32;
}
printf("\nstring
in uppercase : %s",str);
return 0;
}
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