➤ If-else Statement in C
➤ Programs on if-else
➤ Switch Case in C
➤ Switch case Programs
➤ Conditional Operator
➤ While loop in C
➤ Do-while loop in C
➤ While vs do-while
➤ For loop in C
➤ Break keyword in C
➤ Continue keyword in C
➤ Break vs Exit in C
➤ Goto keyword in C
☕️ Flow Control Programs
➤ Largest in 3 Numbers
➤ Find Grade of student
➤ Find the absolute value
➤ Vowel or Consonant
➤ Leap Year Program
➤ Simple calculator in C
➤ Check Odd or Even
➤ Roots of Quadratic Equation
➤ Find Reverse of Number
➤ Factors of a number in C
➤ Generate Multiplication table
➤ Find Power of a Number
➤ Find GCD and LCM
➤ Find factorial of Number
➤ Count Number of Digits
➤ Sum of digits in Number
➤ Sum of N Natural Numbers
➤ Sum of Squares of Natural No.
➤ Find Sum of Odd Numbers
➤ Find the Sum of Series
➤ Find Fibonacci series in C
➤ Sum of the Fibonacci series
➤ Sum until enters +ve numbers
➤ Sum of max 10 no. & Skip -ve
☕️ C Conversion Programs
➤ Celsius to Fahrenheit
➤ Fahrenheit to Celsius
➤ Decimal ↔ Binary
➤ Decimal ↔ Octal
➤ Octal ↔ Binary in C
☕️ Number Programs in C
➤ Prime Number in C
➤ Strong Number in C
➤ Krishnamurthy Number
➤ Neon Number in C
➤ Palindrome number
➤ Perfect Number in C
➤ Armstrong Number
☕️ Pattern Programs in C
➤ Pattern programs in C
➤ Printing pattern using loops
➤ Floyd’s triangle Program
➤ Pascal Triangle Program
➤ Pyramid Star Pattern in C
➤ Diamond Pattern Programs
➤ Half Diamond pattern in C
➤ Print Diamond Pattern
➤ Hollow Diamond Pattern
➤ Diamond Pattern of Numbers
We have already seen how to convert from Celsius to Fahrenheit, in the same way, we can also convert from Fahrenheit to Celsius. The formula that will be used for this problem is given by ⁰C = (5/9) * (⁰F-32)
. In this post, we will write Fahrenheit to Celsius conversion C Program
#include<stdio.h>
int main()
{
float cel, fahr;
printf("Enter Fahrenheit value: ");
scanf("%f", &fahr);
cel = ((5.0/9.0) * (fahr - 32)) ;
printf("Celsius value = %.2f\n", cel);
return 0;
}
Output for different test-cases:-
Enter Fahrenheit value: 210
Celsius value = 98.89
Enter Fahrenheit value: 98
Celsius value = 36.67
Enter Fahrenheit value: -40
Celsius value = -40.00
The -40⁰C is equal to the -40⁰F.
Generally, we need to convert Fahrenheit to Celsius in between an interval. So, now, we will Convert to Celsius for Fahrenheit = 0,30,60,90….,500 . There are various methods, some of which are given here.
C Program to convert Fahrenheit to Celsius in a Range
Fahrenheit to Celsius C Program using While loop
The while loop can be used to convert celsius to Fahrenheit. While loop in C is a pre-test loop where the expression is evaluated then only statements are executed. It uses a test expression to control the loop. Before every iteration of the loop, the test expression is evaluated.
#include<stdio.h>
int main()
{
float celsius, fahr ;
int lower, upper, step ;
lower=0, upper=500, step=30 ;
fahr = lower ;
while ( fahr <= upper )
{
celsius = (5.0/9.0) * (fahr - 32) ;
printf("%3.0f \t %6.1f \n", fahr , celsius) ;
fahr += step ; // fahr = fahr + step
}
return 0;
}
Output:-
0 -17.8
30 -1.1
60 15.6
90 32.2
120 48.9
150 65.6
180 82.2
210 98.9
240 115.6
270 132.2
300 148.9
330 165.6
360 182.2
390 198.9
420 215.6
450 232.2
480 248.9
Fahrenheit to Celsius using For loop
The for loop in C programming language is a pre-test loop, where first of all initialization expression is evaluated then the condition is checked and if the condition is true then only the statements of the for loop are executed. We can use for loop to convert Fahrenheit to Celsius in a range.
#include<stdio.h>
int main()
{
int fahr ;
for(fahr=0 ; fahr <= 500 ; fahr = fahr + 30)
{
printf("%d \t %6.2f \n", fahr, (5.0/9.0) * (fahr - 32) );
}
return 0;
}
In the above methods, we initialized directly lower value 0, upper value 500 and step value 30. For simplicity and good programming practice, we will don’t initialized these values directly within the main() function. In Symbolic constants, names are conventionally written in uppercase so they can be readily distinguished from lower case variable names. Below is another way to write Fahrenheit to Celsius C Program
#include<stdio.h>
#define LOWER 0
#define UPPER 500
#define STEP 30
int main()
{
int fahr ;
for(fahr=LOWER ; fahr <= UPPER ; fahr = fahr + STEP )
{
printf("%d \t %6.2f \n", fahr, (5.0/9.0) * (fahr - 32) );
}
return 0;
}
Notice that there is no semicolon at the end of a #define line.
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