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Sherlin
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Hi,
Can anyone help me to find the power of a number without using pow function in C. For eg., 2.5 raised to the power of 1.5.
Thanks.
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Seun (m)
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If it's an integer, I can help. But raising to the power of a floating point number? No idea!
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c0dec (m)
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for integers this should work: int powi(int number, int exponent)
{
int i, product = 1;
for (i = 0; i < exponent; i++)
product *= number;
return product;
} for floats, well i don't have time now to test it but i guess this should work: double powf(float base, float exponent)
{
return exp(log(base) * exponent);
} |
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c0dec (m)
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oh and if log(x) doesn't produce what u need, try log10(x).
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Seun (m)
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Thanks for sharing. Didn't feel that the use of the log finction would be allowed.  |
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c0dec (m)
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no problem. i didn't think log was allowed but i didnt see any other way of solving it except some taylor series expansion wahala.
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pfowighz (m)
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double powf(float base, float exponent) Shudnt that be float powf(float base, float exponent) The return val cud be a floating point stuff now, cant it? |
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c0dec (m)
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exp() returns a double.
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judy4all
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The easiest way to do it is to call a built in calculator with the expression of your choixe, or an online calculator, for example, http://www.google.com/search?q=5^6 will give you a google page with the answer or 5^6, In c, you can call a get on any website of your choice, eg, http://www.google.com/search?q=5^6, and 'get' will give you all the text derived from the query, you can then use 'sed' to search the expression for the answer to your question, say if u need sample code doing this, |
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