【c语言】购房从银行贷了一笔款d，准本每月还款额为p,月利率为r，计算多少月能还清

// 购房从银行贷了一笔款d，准本每月还款额为p,月利率为r，计算多少月能还清。// d = 300000  p = 6000  r = 0.01  对求得的月份取小数点后一位，第二位四舍五入// m = log( p/(p-d*r))/log(1+r)#include <stdio.h>#include <math.h>int main(){float d = 300000.0;float p = 6000.0;float r = 0.01;float m;m = log( p / ( p - d * r ) ) / log ( 1 + r );printf("需要 %3.1f 个月还清\n",m);return 0;}<img src="http://img.blog.csdn.net/20150423121336736?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvemhhb3lhcWlhbjU1Mg==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />