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C language learned by suffering
C language learned by suffering
Exercise 4
fundamental knowledge
Q1-1
What do you call a string enclosed in ""?
Q 1-2
Instead of the x symbol in math, which symbol is used in C?
Q1-3
Instead of the ÷ symbol in mathematics, which symbol is used in C?
Q1-4
What is the system called in C to represent real numbers?
program read-only
How would the following program appear when executed?
Q2-1
#include <stdio.h>
int main(void)
{
printf("%d\n", 20 / 7);
printf("%f\n", 20.0 / 7.0);
return 0;
}program writing
Q3-1
Create a program that calculates 40 divided by 13 and displays the formula, quotient and remainder.
descriptive expression
Q4-1
In C, if you divide by an integer, the
If the result is not divisible, the result is truncated, but
Briefly explain why.
If the result is not divisible, the result is truncated, but
Briefly explain why.
Basic Knowledge (sample answers)
Solution 1-1
string literal
Solution 1-2
*
*Read as asterisk.
Solution 1-3
/
*Read as slash.
Solution 1-4
floating point representation
Program reading (example solution)
Solution 2-1
2
2.857143
2.857143
*Note that integer divisors are rounded down, not rounded up.
*Answers to real numbers should be correct to about two decimal places.
Question
Program writing (example of solution)
Solution 3-1
#include <stdio.h>
int main(void)
{
printf("%d / %d = %d ... %d\n", 40, 13, 40 / 13, 40 % 13);
return 0;
}*The correct answer is correct even if the symbols for divide and remainder are different.
*Expressions shown as strings are also correct, but the conversion specifier (%d) should be used.
*If no calculation is performed and the answer is a string, it is a wrong answer.
Question
Short Answer Type (Sample Answer)
Solution 4-1
Rounding off the quotient, when you do the reverse calculation, quotient times the number to be divided, you get
A discrepancy arises where the result is greater than the original number to be divided.
Therefore, it is better to truncate because it reduces the inconsistency and the calculation error
A discrepancy arises where the result is greater than the original number to be divided.
Therefore, it is better to truncate because it reduces the inconsistency and the calculation error
About this Site
The C language (bitter C), which is learned by suffering, is
This is the definitive C language introductory site.
It systematically explains the basic functions of the C language and
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