Int how many numbers

There is no int division operator in PHP, to achieve this use the intdiv function. The value can be cast to an int to round it towards zero, or the round function provides finer control over rounding. To explicitly convert a value to int , use either the int or integer casts. However, in most cases the cast is not needed, since a value will be automatically converted if an operator, function or control structure requires an int argument.

A value can also be converted to int with the intval function. If a resource is converted to an int , then the result will be the unique resource number assigned to the resource by PHP at runtime.

See also Type Juggling. When converting from float to int , the number will be rounded towards zero. No warning, not even a notice will be issued when this happens! Note : NaN and Infinity will always be zero when cast to int.

Never cast an unknown fraction to int , as this can sometimes lead to unexpected results. See also the warning about float precision. If the string is numeric or leading numeric then it will resolve to the corresponding integer value, otherwise it is converted to zero 0. The behaviour of converting to int is undefined for other types. Do not rely on any observed behaviour, as it can change without notice. Floating point numbers ». Submit a Pull Request Report a Bug. Integer overflow If PHP encounters a number beyond the bounds of the int type, it will be interpreted as a float instead.

Converting to integer To explicitly convert a value to int , use either the int or integer casts. Even though there are many numeric types in C , the most used for numbers are int for whole numbers and double for floating point numbers.

However, we will describe them all as you continue to read. The int data type can store whole numbers from to In general, and in our tutorial, the int data type is the preferred data type when we create variables with a numeric value. The long data type can store whole numbers from to This is used when int is not large enough to store the value.

Note that you should end the value with an "L":. You should use a floating point type whenever you need a number with a decimal, such as 9. The float data type can store fractional numbers from 3. Note that you should end the value with an "F":. The double data type can store fractional numbers from 1. Note that you can end the value with a "D" although not required :. Another string approach. Short and sweet - for any integer n.

ThisClark ThisClark Only works for positive integer n and zero. Can it be? Can I try? DmitryK DmitryK 5, 1 1 gold badge 19 19 silver badges 32 32 bronze badges. How about plain old Mathematics? Divide by 10 until you reach 0. Sinista Sinista 1 1 gold badge 6 6 silver badges 12 12 bronze badges. Have you tested it? You know that, even tough it makes sense for a human viewpoint, it doesn't really work the same with the machine's "way-of-thinking", right?

The principle looks correct to me. What "shocking" result are you referring to? Let's just say that computers They don't like dividing. And in cases where large "queues" of large numbers need to be processed, and each digit in each processed number will require a division Things "start getting really slow really fast" If you catch my meaning TheLima what are you talking about?

For an int, this loop executes a maximum of 11 times. Do you have some evidence for your assertions? EJP From a hardware viewpoint, division is an iterative process. The fastest division algorithm I know of is radix4, which generates 4 bits per iteration; so a 32 bit divide needs 8 iterations at least.

Multiplications, for example, can be done in parallel, and also be broken down into simpler multiplications; either down to bit level requiring only 5 operations , or with partial break down plus a look-up table at the end Classic size VS speed trade-off. That's kinda hard to read. But damn is it portable! Curious, I tried to benchmark it Test; import static org. Jean Jean Just for the fun of it, what's the difference across a distribution of values of number, from say 0 to a trillion?

Teepeemm 3, 5 5 gold badges 30 30 silver badges 51 51 bronze badges. A divide-and-conquer would start at the middle and bisect the remaining search area. This has a linear run time. But it won't matter for only 9 comparisons. Sameer Khanal Sameer Khanal 10 10 silver badges 10 10 bronze badges.

Sahil Sahil 2 2 silver badges 13 13 bronze badges. This will loop indefinitely for all values larger than What about this recursive method? Jedi Dula Jedi Dula 53 1 1 silver badge 10 10 bronze badges. ShoeMaker 8 8 silver badges 31 31 bronze badges. VoidCatz VoidCatz 2 2 gold badges 5 5 silver badges 13 13 bronze badges. I wouldn't call a one line for loop with an empty body simple. Nor modulo a power of 10 to see if you get the same thing back can't you just use a comparison?

Therefore this leftmost bit represents a sign bit just as with two's complement integers. If this bit is set, the number is negative, otherwise the number is positive. The largest positive number that can be represented is still -m but the largest negative number is The resolution is still -m. There is a terminology for naming the resolution of signed fractions. If there are m bits to the right of the decimal point, the number is said to be in Q m format. For a 16 bit number 15 bits to the right of the decimal point this results in Q15 notation.

Exercises: Convert 1. Signed binary fractions are easily extended to include all numbers by representing the number to the left of the decimal point as a 2's complement integer, and the number to the right of the decimal point as a positive fraction.

Note, that as with two's complement integers, the leftmost digit can be repeated any number of times without affecting the value of the number. Another way to convert Q m numbers to decimal is to represent the binary number as a signed integer, and to divide by 2 m.

To convert a decimal number to Q m , multiply the number by 2 m and take the rightmost m digits. Note, this simply truncates the number; it is more elegant, and accurate, but slightly more complicated, to round the number.

Comments or Questions? Representation of Numbers. Decimal Hexadecimal Binary 0 0 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 A 11 B 12 C 13 D 14 E 15 F Binary Unsigned Signed 35 35 -1 Decimal 4 bit 8 bit 3 -3 7 -5 Convert 1.

Convert 0. The answer is This is represented in binary as , so the Q7 representation is 0. This agrees with the result of the previous exercise Positive Binary Fractions. Convert The Q7 representation is 1. This agrees with the result of the previous exercise Signed Binary Fractions. This section is not complete. In 'C', an unsigned integer is usually 16 bits. Convert 37 to binary, shift it left by one and convert back to decimal.

What is the result. Answer 7D0. Answer A7B. If you shift a hexadecimal number to the left by one digit, how many times larger is the resulting number? In 'C', a signed integer is usually 16 bits. What is the largest negative number that can be represented? Answer 0.