C Exercises: Converts a temperature from Centigrade to Fahrenheit

Last update on July 29 2025 12:53:46 (UTC/GMT +8 hours)

1. Centigrade to Fahrenheit Conversion

Write a C program that convert a temperature from Centigrade to Fahrenheit.

C programming : Centigrade and Fahrenheit Temperatures :

The centigrade scale, which is also called the Celsius scale, was developed by Swedish astronomer Andres Celsius. In the centigrade scale, water freezes at 0 degrees and boils at 100 degrees. The centigrade to Fahrenheit conversion formula is:

Fahrenheit and centigrade are two temperature scales in use today. The Fahrenheit scale was developed by the German physicist Daniel Gabriel Fahrenheit . In the Fahrenheit scale, water freezes at 32 degrees and boils at 212 degrees.

C = (5/9) * (F - 32)

where F is the Fahrenheit temperature. You can also use this Web page to convert Fahrenheit temperatures to centigrade. Just enter a Fahrenheit temperature in the text box below, then click on the Convert button.

C Input Output: Converts a temperature from Centigrade to Fahrenheit.

Sample Solution:

C Code:

#include <stdio.h>     // Include the standard input/output header file.

float temp_f;     /* degrees fahrenheit */
float temp_c;     /* degrees centigrade */
char line_text[50];        /* a line of input */

int main() {
printf("Input a temperature (in Centigrade): ");  // Prompt the user to input a temperature in centigrade.
fgets(line_text, sizeof(line_text), stdin);      // Read a line of input from the user and store it in 'line_text'.
sscanf(line_text, "%f", &temp_c);               // Convert the input from 'line_text' to a float and store it in 'temp_c'.

temp_f = ((9.0 / 5.0) * temp_c) + 32.0;         // Convert temperature from centigrade to fahrenheit and store it in 'temp_f'.
printf("%f degrees Fahrenheit.\n", temp_f);    // Print the temperature in fahrenheit.

return(0);   // Return 0 to indicate successful execution of the program.
}

Sample Output:

Input a temperature (in Centigrade): 45                                                                       
113.000000 degrees Fahrenheit.

Flowchart:

For more Practice: Solve these Related Problems:

Write a C program to convert a list of centigrade temperatures to Fahrenheit using dynamic memory allocation.
Write a C program to convert Centigrade to Fahrenheit without using floating point arithmetic by scaling the values.
Write a C program to perform Centigrade to Fahrenheit conversion using macros for conversion factors and validate user input.
Write a C program to convert Centigrade to Fahrenheit and then convert the result back to Centigrade to verify accuracy.

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