C programming/math.h/log

Logarithmic function in 'c' language these functions are under math.h. In general log(x) i.e ln(x) and log10(x) these are two types of logarithm.In C language function is available for both of these. so that we can use mathematical terms effectively. log(x) is natural logarithm. log10 is base 10. 1.log/ln double log (double x); float log (double x); long double log (long double x); return value return the natural logarithm of x. The natural logarithm is the base-e logarithm, the inverse of the natural exponential function. #include <stdio.h> #include <stdlib.h> void main() { int num a,b,c,d; #ifdef __WIN32 system("cls"); // for Windows #else system("clear"); // for Unix and Linux #endif printf("\n\tadddtion of 1 "); scanf("%d",&a); printf("\n\tsubtraction of 2"); scanf("%d",&b); printf("\n\tmutiplication of 3"); scanf("%d",&c); printf("\n\tdivide of 4"); scanf("%d",&d); getchar(); } log10 double log10 (double x); float log10 (double x); long double log10 (long double x); Return value' compute common logarithm and return the common(base - 10) logarithm of x, where x>0. example program #include <stdio.h> #include <math.h> int main() { double vrbl, result; vrbl = 100; result = log10 (vrbl); printf("log10(%lf) = %lf\n", vrbl, result ); return 0; } Notes cpluspluse cpluspluse math:log http://www.cplusplus.com/reference/clibrary/cmath/log/ cplusplus cplusplus 30/9/2011 deep