What does %.2e mean in C language?

%.2e in C language is used to format floating point numbers into scientific notation, that is, a * 10^b, where the absolute value of a is between 1.0 and 10.0, and b is an integer with a precision of 2 decimal place, the exponent symbol is e.

The meaning of %.2e in C language

%.2e is the printf format string in C language A conversion specifier for formatting floating-point numbers in scientific notation.

Syntax:

<code class="c">printf("%.2e", float_variable);</code>

Among them:

• %.2e: Format specifier
• float_variable: To format ized floating point number

Function:

%.2e conversion specifier formats the floating point number into scientific notation, that is:

<code>a * 10^b</code>

Where:

• a is a floating point number whose absolute value is between 1.0 and 10.0.
• b is an integer representing the exponent of a floating point number.

Format options:

• Precision: Number .2 specifies a precision of 2 decimal places. The accuracy can be adjusted as needed.
• Exponent symbol: e represents the exponent symbol. You can also use E to represent the exponential notation.

Example:

<code class="c">#include <stdio.h>

int main() {
    float number = 12345.6789;
    printf("%.2e\n", number);  // 输出：1.23e+04
    return 0;
}</code>

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