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The difference between ++i and i++ in c++

Apr 26, 2024 pm 07:30 PM
c++

In C, the difference between the increment operators i and i is the order of execution: i is incremented first and then the expression is evaluated, while i is first evaluated and then incremented. Therefore, use i when you need to use the incremented value immediately, and use i when you need to use the original value first and then increment it.

The difference between ++i and i++ in c++

The difference between i and i in C

In C, i and i are both increment operators, but they differ in the order of execution.

i: Prefix increment

  • The value of i will be incremented before calculating the expression .
  • Syntax: i
  • The following example increases the value of i by 1 and then prints the result:
int i = 10;
cout << ++i << endl; // 输出:11
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i : post-increment

  • Evaluates the expression first, and then increments the value of i.
  • Syntax: i
  • The following example prints the value of i and then increments it by 1:
int i = 10;
cout << i++ << endl; // 输出:10
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Summary

  • i Increments i before evaluating the expression.
  • i Increments i after evaluating the expression.
  • Use i when you need to increment i and use its new value immediately. Use i when you need to use the original value of i before incrementing it.

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