OOP 344 Week 2

OOP 344 Week 2

Environment Variable Content Search Program

 V2

---

#include <iostream>

#include <cstring>

using namespace std;

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

int i;

int pos;

int check=0;

char content[50];

if (argc != 2) {

cout << "Only input one parameter after program name" << endl;

} else {

for (i=0; env[i]!=0 && check==0; i++) {

pos = strcspn(env[i], "=");

if (strncmp(argv[1], env[i], pos) == 0) {

check = 1;

strcpy(content, env[i]+pos+1);

}

}

if (check==1)

cout << argv[1] << " = " << content << endl;

else

cout << argv[1] << " not found" << endl;

        }

    return 0;

}

Better now.

---

$ prnenv path<ENTER>

/* case sensitive */

#include <iostream>

#include <cstring>

using namespace std;

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

  int i;

  int j;

  int k;

  int check=0;

  char p1[30];

  char p2[30];

  if (argc == 2) {

  for (i=0; env[i]!=0 && check==0; i++) {

 for (j=0; env[i][j] != '='; j++) {

 p1[j]=env[i][j];

 }

 p1[j]='\0';

 if (strcmp(argv[1], p1)==0) {

 check=1;

 for (k=0; env[i][k+j+1]!='\0'; k++) {

 p2[k]=env[i][k+j+1];

 }

 p2[k]='\0';

 }

  }

  if (check==1)

 cout << argv[1] << " = " << p2 << endl;

  else

 cout << argv[1] << " not found" << endl;

  }

  return 0;

}

This works but its pretty hideous looking

WEEK 2: Command Line Programs

---

$ add num num<ENTER>

#include <iostream>
#include <stdlib.h>
using namespace std;

int main(int argc, char* argv[]) {
  int sum;
if (argc==3) {    //only accept three parameters
sum = atoi(argv[1]) + atoi(argv[2]);
cout << "The sum of the two numbers is: " << sum << endl;
} else {
cout << "Enter 2 valid parameters after the program name" << endl;
}
return 0;
}

---

$ sub num num<ENTER>

#include <iostream>
#include <stdlib.h>
using namespace std;

int main(int argc, char* argv[]) {
  int diff;
if (argc==3) {    //only accept three parameters
diff = atoi(argv[1]) - atoi(argv[2]);
cout << "The difference between of the two numbers is: " << diff << endl;
} else {
cout << "Enter 2 valid parameters after the program name" << endl;
}
return 0;
}

---

$ mul num num<ENTER>

#include <iostream>
#include <stdlib.h>
using namespace std;

int main(int argc, char* argv[]) {
  int total;
if (argc==3) {    //only accept three parameters
total = atoi(argv[1]) * atoi(argv[2]);
cout << argv[1] << " * " << argv[2] << " is: " << total << endl;
} else {
cout << "Enter 2 valid parameters after the program name" << endl;
}
return 0;
}

---

$ div num num<ENTER>

#include <iostream>
#include <stdlib.h>
#include <iomanip>
using namespace std;

int main(int argc, char* argv[]) {
double total;
if (argc==3) { //only accept three parameters
total = (double) atoi(argv[1]) / (double) atoi(argv[2]);
cout << argv[1] << " / " << argv[2] << " is: " << fixed << setprecision(2) << total << endl;
} else {
cout << "Enter 2 valid parameters after the program name" << endl;
}
return 0;
}

This gets the job done but doesn't really check the parameters to see if they are just integers. I tried to do the checking but that somehow screwed up the negative integers. Anyways, maybe I'll try again over next days.