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Consider the following program. It opens filel and file2 which have already been created with: rm filel; rm file2; touch filel; touch file2; echo "ghi" > filel echo "gst" > file2 Therefore, each file contains 4 bytes. Here is the program (it will not compile as is because it contains a question mark): /* problem7.c */ #include cunistd.h> int main(void) { char buffer = 'W'; open ("file2",2); open ("filel",2); Iseek (3, ?,1);: write(3,&buffer, 1); Iseek (4, -2,2); write(4,&buffer, 1); read (0, &buffer, 1); write(4,&buffer,1); Iseek (3, -3,2); write(3, &buffer, 1): write(4, "\n",1); Iseek (4,1,0): write(4, &buffer, 1); close(3); close(4); Without a further header file compilation will produce a warning, but this will not affect this problem. When you enter a certain character and the single question mark is replaced with an appropriate number cat filel produces: gsws and cat file2 produces: gstw What is that number and what is that character? The single question mark (?) should be replaced with: After the program starts you should enter the character:

Consider the following program. It opens filel and file2 which have already been created with: rm filel; rm file2; touch filel; touch file2; echo "ghi" > filel echo "gst" > file2 Therefore, each file contains 4 bytes. Here is the program (it will not compile as is because it contains a question mark): /* problem7.c */ #include cunistd.h> int main(void) { char buffer = 'W'; open ("file2",2); open ("filel",2); Iseek (3, ?,1);: write(3,&buffer, 1); Iseek (4, -2,2); write(4,&buffer, 1); read (0, &buffer, 1); write(4,&buffer,1); Iseek (3, -3,2); write(3, &buffer, 1): write(4, "\n",1); Iseek (4,1,0): write(4, &buffer, 1); close(3); close(4); Without a further header file compilation will produce a warning, but this will not affect this problem. When you enter a certain character and the single question mark is replaced with an appropriate number cat filel produces: gsws and cat file2 produces: gstw What is that number and what is that character? The single question mark (?) should be replaced with: After the program starts you should enter the character:

Database System Concepts
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
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Consider the following program. It opens filel and file2 which have already been created with: rm filel; rm file2; touch filel; touch file2; echo "ghi" > filel echo "gst" > file2 Therefore, each file contains 4 bytes. Here is the program (it will not compile as is because it contains a question mark): /* problem7.c */ #include <unistd.h> int main(void) { char buffer = 'W'; open ("file2",2); open ("filel",2); Iseek (3, ?,1);: write(3,&buffer, 1); Iseek (4, -2,2); write(4,&buffer, 1); read (0, &buffer, 1); write(4, &buffer, 1); Iseek (3, -3,2); write(3, &buffer, 1): write(4, "\n", 1); Iseek (4,1,0): write(4, &buffer, 1); close(3); close(4); Without a further header file compilation will produce a warning, but this will not affect this problem. When you enter a certain character and the single question mark is replaced with an appropriate number cat filel produces: gsws and cat file2 produces: gstw What is that number and what is that character? The single question mark (?) should be replaced with: After the program starts you should enter the character:
Transcribed Image Text:Consider the following program. It opens filel and file2 which have already been created with: rm filel; rm file2; touch filel; touch file2; echo "ghi" > filel echo "gst" > file2 Therefore, each file contains 4 bytes. Here is the program (it will not compile as is because it contains a question mark): /* problem7.c */ #include <unistd.h> int main(void) { char buffer = 'W'; open ("file2",2); open ("filel",2); Iseek (3, ?,1);: write(3,&buffer, 1); Iseek (4, -2,2); write(4,&buffer, 1); read (0, &buffer, 1); write(4, &buffer, 1); Iseek (3, -3,2); write(3, &buffer, 1): write(4, "\n", 1); Iseek (4,1,0): write(4, &buffer, 1); close(3); close(4); Without a further header file compilation will produce a warning, but this will not affect this problem. When you enter a certain character and the single question mark is replaced with an appropriate number cat filel produces: gsws and cat file2 produces: gstw What is that number and what is that character? The single question mark (?) should be replaced with: After the program starts you should enter the character:
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