Answered: Task 1: Understanding strcpy and Array…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Task 1: Understanding strcpy and Array Bounds
1. Run the following C program:
#include <string.h>
#include <stdio.h>
int main() {
char str[10];
int i = 0;
strcpy(str, "012345678");
for (i = 0; i < 1000000; i++) {
printf("%c", str[i]);
}
return 0;
}
• When you compile and execute the program, you may encounter compiler warnings.
• Observe the program's output and explain what you see and why.
Task 2: Command-Line Arguments and String Copying
#include <string.h>
#include <stdio.h>
int main(int argc, char* argv[]) {
char str[10];
char *arg1 = argv[1];
int i = 0;
int j = 0;
while (arg1[i] != '\0') {
str[i] = arg1[i];
i++;
}
while (str[j] != '\0') {
printf("%c", str[j]);
j++;
}
return 0;
}

a. Execute the program with 012345678 as the command-line argument. Observe the output.
b. Execute the program with 01. as the command-line argument. Observe the output. Explain what you see and
why.
c. Execute the program with 01234567890123 as the command-line argument. Observe the output. Explain
what you see and why.
d. Fix the condition inside the while loop on line 12 to always print the right amount of characters and never
read past the end of the str array.

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