how to convert float to int in c

Integer division truncates, so (50/100) results in 0. You can cast to float (better double) or multiply with 100.0 (for double precision, 100.0f for float precision) first,

double percentage;
// ...
percentage = 100.0*number/total;
// percentage = (double)number/total * 100;

or

float percentage;
// ...
percentage = (float)number/total * 100;
// percentage = 100.0f*number/total;

Since floating point arithmetic is not associative, the results of 100.0*number/total and (double)number/total * 100 may be slightly different (the same holds for float), but it's extremely unlikely to influence the first two places after the decimal point, so it probably doesn't matter which way you choose.

2 of 11

11

integer division in C truncates the result so 50/100 will give you 0

If you want to get the desired result try this :

((float)number/total)*100

or

50.0/100

Discussions

How do I cast my int to float?

To cast a value, you put the destination type in brackets before the value or variable you want to cast, for example (float)x would cast x to a float. However, I assume you're talking about L and S here, in which case just casting won't do you any good since you've declared them as int. They won't be able to hold any decimal places, so casting them to a float would just give you the same wrong number but as a float instead of an int. More on reddit.com

r/cs50

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October 4, 2021

Converting int to float in C function - Stack Overflow

So I have some source code that needs to be modified to include a 3rd mathematical formula. The source code is: #include int sum_and_diff (int a, int b, int *res) { int sum; ... More on stackoverflow.com

stackoverflow.com

convert float to integer - C++ Forum

I want 12.345-->12 23.468-->23 i am newbie, i can do it by nearest integer y = floor(x+0.5); but want to learn by other way, prompt In function ‘int main()’: error: expected ‘)’ before ‘int’ More on cplusplus.com

cplusplus.com

Does C allow implicit casting/conversion from float to an int?

Yes, this sort of conversion is implicitly performed. Behaviour is undefined if the result doesn't fit. More on reddit.com

r/C_Programming

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November 21, 2020

Videos

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Convert int to float in c++ | Integer to float datatype conversion

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How To Convert Int To Float In C

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WsCube Tech

wscubetech.com › resources › c-programming › programs › float-to-int

How to Convert Float to Int in C? 5 Programs

May 9, 2026 - Learn how to convert a float to an int in C with 5 simple programs. Explore different methods using type casting, floor(), ceil(), and round().

Medium

medium.com › @brajagopal.tripathi › how-to-convert-any-float-number-to-an-integer-in-c-a6cc59e5f9f5

How to convert any float number to an integer in c? | by Brajagopal Tripathi | Medium

September 20, 2023 - How to convert any float number to an integer in c? There are two ways to convert a float number to an integer in C: Using the built-in int() function. This function will take a float as an input and …

Quora

quora.com › How-do-I-convert-any-float-number-to-integer-in-c

How to convert any float number to integer in c - Quora

Answer (1 of 23): First, if the non-fractional part of a [code ]float[/code] is representable as an [code ]int[/code], an implicit conversion that “rounds toward zero” (i.e., drops the fractional) exists: [code]int r(float f) { int result = f; return result; // You could just write "return ...

W3Schools

w3schools.com › c › c_type_conversion.php

C Data Type Conversion

This can be risky, as you might lose control over specific values in certain situations. Especially if it was the other way around - the following example automatically converts the float value 9.99 to an int value of 9:

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Jukka Korpela

jkorpela.fi › round.html

How can I convert a floating-point value to an integer in C?

There is no direct tool (like an operator or a library function) for rounding conversion, and strictly speaking a rounding conversion is not a conversion in the same sense that those conversions which are defined in the C standard. For positive floating-point values, the simplest way to achieve a rounding conversion is to use an expression like · (long) (x+0.5) but it is better to be prepared for negative values, even if you do not expect them to occur. This means that one should use the conditional expression · x >= 0 ? (long)(x+0.5) : (long)(x-0.5) The value of this is expression is the integer which is nearest to the value of the floating-point value of x.

Thiyagaraaj

c-lang.thiyagaraaj.com › archive › c-blog › convert-a-floating-point-value-to-an-integer-in-c

Convert a Floating-point value to an Integer in C - C Programming

you can convert floating point to integer but the straight conversion has some problem.we cannot get the correct value.

Silicon Cloud

silicloud.com › home › convert float to int in c: guide

Convert Float to Int in C: Guide - Blog - Silicon Cloud

August 5, 2025 - These functions return a float type result that needs to be further converted to an int type. ... Include the math header file and declare a float variable ‘num’ with a value of 3.14. Use the ceilf function to round ‘num’ up to the nearest integer and store it in ‘result’. Use the floorf function to round ‘num’ down to the nearest integer and store it in ‘result2’. Use the roundf function to round ‘num’ to the nearest integer and store it in ‘result3’.

Carnegie Mellon University

cs.cmu.edu › ~rbd › papers › cmj-float-to-int.html

Danger in Floating-Point-to-Integer Conversion

i = (int)(f + 0.5); C does not round negative numbers down, so values in the interval (-1.5, 0.5) are converted to zero. In contrast, a correct conversion should map only the interval (-0.5, 0.5) to zero. There are several ways to perform rounding for audio, and, surprisingly, proper rounding ...

reddit.com › r/cs50 › how do i cast my int to float?

r/cs50 on Reddit: How do I cast my int to float?

October 4, 2021 -

int main (void)

{

string text = get_string("Text: ");

int Letters = count_letters(text);

int words = count_words(text);

int sen = count_sen(text);

int L = (100/words) * Letters;

int S = (100/words) * Letters;

int index = 0.0588 * L - 0.296 * S - 15.8;

int index1 = round(index);

printf("%i\n", Letters);

printf("%i\n", words);

printf("%i\n", sen);

printf("%i\n", index1);

}

Top answer

1 of 1

3

To cast a value, you put the destination type in brackets before the value or variable you want to cast, for example (float)x would cast x to a float. However, I assume you're talking about L and S here, in which case just casting won't do you any good since you've declared them as int. They won't be able to hold any decimal places, so casting them to a float would just give you the same wrong number but as a float instead of an int.

Facebook

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Converting float to int in C programming

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Medium

medium.com › @ryan_forrester_ › c-float-to-int-conversion-how-to-guide-aea5be6d3d4b

C++ Float to Int Conversion (How To Guide) | by ryan | Medium

January 7, 2025 - - Floats use the IEEE 754 standard, consisting of a sign bit, exponent, and mantissa. This fundamental difference in representation is the root of many conversion challenges. The simplest way to convert a float to an int is through direct casting:

Stack Overflow

stackoverflow.com › questions › 67962778 › converting-int-to-float-in-c-function

Converting int to float in C function - Stack Overflow

Top answer

1 of 1

2

float div;
// ...
printf ("The quotient of %.0f and %d is %f\n", a, b, div);

You declared a local variable called div which has no connection to the function named div (but shadows it). Then you print out the value of this variable, which was never initialized and therefore contains garbage, resulting in incorrect output or other undefined behavior.

You should delete the declaration float div; and instead call the function:

printf ("The quotient of %.0f and %d is %f\n", a, b, div(a,b));

Try it: https://onlinegdb.com/cw12CCTUH

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TutorialsPoint

tutorialspoint.com › cprogramming › c_type_casting.htm

Type Casting in C

If one operand is a float − The ... to float. If any of the operands is double − The result is promoted to double. Integer promotion is the process by which values of integer type "smaller" than int or unsigned int are converted either to int or unsigned int. Consider an example of adding a character with an integer ...

w3resource

w3resource.com › c-programming-exercises › c-snippets › how-to-convert-a-character-to-an-integer-float-in-c.php

Convert character to integer, float in C

November 1, 2025 - #include <stdio.h> #include <stdlib.h> int main() { char char_array1[] = "45.82734"; float float_value = atof(char_array1); printf("The converted value is: %f\n", float_value); return 0.

Quora

quora.com › How-do-you-convert-a-float-to-an-integer-using-casting-in-the-programming-language-C

How to convert a float to an integer using casting in the programming language C++ - Quora

Range/overflow: if the float value is outside the target int range, behavior is implementation-defined or undefined for some conversions. Check against numeric_limitswzxhzdk:14::max()/min() when needed. NaN/inf: converting NaN or ±inf to an integer has undefined behavior; guard beforehand.

Cplusplus

cplusplus.com › forum › beginner › 33018

convert float to integer - C++ Forum

I want 12.345-->12 23.468-->23 i am newbie, i can do it by nearest integer y = floor(x+0.5); but want to learn by other way, prompt In function ‘int main()’: error: expected ‘)’ before ‘int’

Daniel Lemire's blog

lemire.me › blog › 2020 › 12 › 14 › converting-floating-point-numbers-to-integers-while-preserving-order

Converting floating-point numbers to integers while preserving order – Daniel Lemire's blog

December 14, 2020 - In such cases, an alternative is: uint64_t mask = x & ((uint64_t)1 << 63); return x ^ (mask - 1); ... Very nice indeed. ... Is it possible to compare signed integers with a floating-point compare, or do some bit-patterns not work?