Answered: program that reads an unsigned number…

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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Question

Develop a C++ program that reads an unsigned number in some base and outputs the
equivalent value in a target base. The input file providing these values will be organized to
allow for comment lines and blank lines along with data lines. Use only a single source file so I
can more easily script the downloading and compiling of your submissions.
Your program must require a single command line argument, the name of an input file. This
input file will consist of any number of lines, each falling into one of three varieties:
1. Comment - These lines always start with an at-symbol ('@') and should be completely
ignored.
2. Blank line - Used to visually organize the input file and should be completely ignored.
3. Data line - These are the ones your program will process and are described below.
Data lines will all have exactly 3 items separated by a single space character and end with a
newline:
1. an input base (2 through 36) identified in decimal. Digits representing coefficients
between 10 and 35 will use the letters 'A'-'Z' and/or 'a'-'z' (i.e., they could be upper or
lower case)
2. an input value in that base whose binary equivalent will never be more than 30 bits
long
3. an output base (2 through 36) identified in decimal
For each Data line from the input file, you must output:
1. the line number of the input file this data line is on (starting the file with line 1… same as
a text editor would show)
2. a colon followed by a space
3. the equivalent of the input value in the output base using upper case letters A-Z for
any coefficients with the value of 10-35. NEVER print any leading zeros
a. eg, instead of 000123, you would print 123
b. only exception is if the value itself is zero, as in the example below
Example input file Expected output to console

Input:
@ a first example
8 70 4
2 011100 16
7 0 21
11 3A 10

Output:
2: 320
4: 1C
5: 0
6: 43

Expert Solution

Step 1

C program

main.c

#include<stdio.h> // library for standard input-output

#include<math.h> // library for pow function

#include<string.h> // library for strings

#include<ctype.h> // library for character types

// function that takes a data line and prints the output

void data_line(char line[])

{

// int for input base

int input_base;

// string for value

char value[35];

// int for output base

int output_base;

// read input base, value, output base from data line

sscanf(line,"%d %s %d",&input_base,value,&output_base);

// calculate the length of value

int n = strlen(value);

// int to store the decimal value for value with input base

int decimal=0;

// convert the value from input base to decimal

for(int i=n-1;i>=0;i--)

{

// if it is a digit

if(value[i]>='0' && value[i]<='9')

{

decimal += pow(input_base,n-i-1)*(value[i]-'0');

}

// if it is a character

else

{

// convert character to lower case

value[i]=tolower(value[i]);

decimal += pow(input_base,n-i-1)*(value[i]-'a'+10);

}

// array to store value with output base

char output[35];

// int to store count of output

int k=0;

// repeat until decimal value is 0

while(decimal>0)

{

// calculate the remainder

int rem = decimal%output_base;

// convert the remainder to its corresponding character

if(rem>=10)

output[k]=('A'+rem-10);

else

output[k]=('0'+rem);

// increase the count

k++;

// calculate the remaining decimal value

decimal = decimal/output_base;

}

// if count is 0 print 0

if(k==0)

{

printf("0\n");

}

else

{

// print the output to console

for(int i=k-1;i>=0;i--)

printf("%c",output[i]);

printf("\n");

}

// main function

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

{

// open the file in read mode

// input file is in first argument of command line

FILE *fp = fopen(argv[1],"r");

// char array used to read every line in input file

char line[100];

// int to store the line number to print to console

int line_no = 1;

// read until EOF (end of file)

while(fscanf(fp,"%[^\n]%*c",line)!=EOF)

{

// check if the current line is a data line

// if there is a data line then definitely first character will be a digit

if(line[0]>='0' && line[0]<='9')

{

// print the line number

printf("%d: ",line_no);

// call the function to convert from input base to output base

data_line(line);

}

// increase the line number

line_no++;

}

// close the file finally

fclose(fp);

}

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