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Chapter 10: Problem 30

Look at the following statements. char str[] = "237.89"; double value; Write a statement that converts the string in str to a double and stores the result in value.

Short Answer

Expert verified
Answer: We can use the atof() function from the "stdlib.h" library to convert a string containing a floating-point number into a double value. Include the "stdlib.h" library at the beginning of the code and then use the atof() function to convert the string.

Step by step solution

01

Include necessary library

To use the atof() function, include the "stdlib.h" library at the start of the program by adding the following line: ```c #include ```
02

Convert the string to a double value using atof() function

Use the atof() function to convert the string "str" into a double value and store the result in the variable "value": ```c value = atof(str); ``` So, the complete code would look like this: ```c #include #include int main() { char str[] = "237.89"; double value; value = atof(str); printf("String: %s\n", str); printf("Double: %.2lf\n", value); return 0; } ``` This code will convert the string "237.89" into a double and store it in the variable "value." The program then prints out both the original string and the converted double value.

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Most popular questions from this chapter

Assume c is a char variable. What value does c hold after each of the following statements executes? Statement \(\quad\) Contents of \(c\) \(c=\) toupper \(\left(^{\prime} a^{\prime}\right)\) ___ \(c=\) toupper \(\left(^{\prime} B^{\prime}\right)\) ___ \(c=\) tolower \(\left(^{\prime} D^{\prime}\right)\) ___ \(c=\) toupper \(\left(^{\prime} e^{\prime}\right)\) ___

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