前幾日工作中有以科學(xué)計(jì)數(shù)法輸出的需要，當(dāng)時(shí)不知道庫函數(shù)就有對應(yīng)的格式，還自己寫了一個(gè)，昨日經(jīng)理說庫函數(shù)自帶，發(fā)現(xiàn)庫函數(shù)的確支持。
linux執(zhí)行man 3 printf，可以在手冊中看到如下描述

e, E
The double argument is rounded and converted in the style [-]d.ddde±dd where there is one digit before the decimal-point character and the number of digits after it is equal to the precision; if the precision is missing, it is taken as 6; if the precision is zero, no decimal-point character appears. An E conversion uses the letter E (rather than e) to introduce the exponent. The exponent always contains at least two digits; if the value is zero, the exponent is 00.

實(shí)驗(yàn)代碼如下：

#include<stdio.h>int main(){printf("%.2E\n", 0.00001);printf("%.2E\n", 1.00001);printf("%.2E\n\n", 1234.234);printf("%.2e\n", 0.00001);printf("%.2e\n", 1.00001);printf("%.2e\n", 1234.234);return 0; } 1.00E-05 1.00E+00 1.23E+031.00e-05 1.00e+00 1.23e+03

sprintf也支持科學(xué)計(jì)數(shù)法的格式化，用法和printf相同。

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