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<span style="font-size:14px; color:#000099;">Pre and Post Increment and Decrement</span> | <span style="font-size:14px; color:#000099;"><strong>Pre and Post Increment and Decrement</strong></span> | ||
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<span style="color:#000000;">++x is pre-increment and --x is pre-decrement</span> | <span style="color:#000000;">++x is pre-increment and --x is pre-decrement</span> | ||
<span style="color:#000000;">x++ is post-increment and x-- is post-decrement</span> | <span style="color:#000000;">x++ is post-increment and x-- is post-decrement</span> | ||
<br /> | |||
<span style="color:#000000;">With ++x and --x: means x is incremented '''BEFORE''' being used.</span> | <span style="color:#000000;">With ++x and --x: means x is incremented '''BEFORE''' being used.</span> | ||
<span style="color:#000000;">With x++ and x--: means x is incremented '''AFTER''' being used.</span> | <span style="color:#000000;">With x++ and x--: means x is incremented '''AFTER''' being used.</span> | ||
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<span style="color:#a52a2a; font-size: 12px;">Examples</span> | |||
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<span style="color:#a52a2a; | |||
<span style="color:#000000;">number a = 1;</span> | <span style="color:#000000;">number a = 1;</span> | ||
<span style="color:#000000;">number b;</span> | <span style="color:#000000;">number b;</span> | ||
<span style="color:#000000;">b = ++a;</span> | <span style="color:#000000;">b = ++a;</span> | ||
<span style="color:#000000;">print(b); </span><span style="color:#008000;">// 2</span> | <span style="color:#000000;">print(b); </span><span style="color:#008000;">// 2</span> | ||
<span style="color:#000000;">print(a); </span><span style="color:#008000;">// 2</span> | <span style="color:#000000;">print(a); </span><span style="color:#008000;">// 2</span> | ||
<span style="color:#000000;">b = --a;</span> | <span style="color:#000000;">b = --a;</span> | ||
<span style="color:#000000;">print(b); </span><span style="color:#008000;"> // 1</span> | <span style="color:#000000;">print(b); </span><span style="color:#008000;"> // 1</span> | ||
<span style="color:#000000;">print(a); </span><span style="color:#008000;">// 1</span> | <span style="color:#000000;">print(a); </span><span style="color:#008000;">// 1</span> | ||
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<span style="color:#000000;">number c = 3;</span> | <span style="color:#000000;">number c = 3;</span> | ||
<span style="color:#000000;">number d;</span> | <span style="color:#000000;">number d;</span> | ||
<span style="color:#000000;">d = c++;</span> | <span style="color:#000000;">d = c++;</span> | ||
<span style="color:#000000;">print(d); </span><span style="color:#008000;">// 3</span> | <span style="color:#000000;">print(d); </span><span style="color:#008000;">// 3</span> | ||
<span style="color:#000000;">print(c); </span><span style="color:#008000;">// 4</span> | <span style="color:#000000;">print(c); </span><span style="color:#008000;">// 4</span> | ||
<span style="color:#000000;">d = c--;</span> | <span style="color:#000000;">d = c--;</span> | ||
<span style="color:#000000;">print(d); </span><span style="color:#008000;">// 4</span> | <span style="color:#000000;">print(d); </span><span style="color:#008000;">// 4</span> | ||
<span style="color:#000000;">print(c); </span><span style="color:#008000;">// 3</span> | <span style="color:#000000;">print(c); </span><span style="color:#008000;">// 3</span> | ||
Revision as of 03:27, 14 September 2011
Pre and Post Increment and Decrement
++x is pre-increment and --x is pre-decrement
x++ is post-increment and x-- is post-decrement
With ++x and --x: means x is incremented BEFORE being used.
With x++ and x--: means x is incremented AFTER being used.
Examples
number a = 1; number b; b = ++a; print(b); // 2 print(a); // 2 b = --a; print(b); // 1 print(a); // 1
number c = 3; number d; d = c++; print(d); // 3 print(c); // 4 d = c--; print(d); // 4 print(c); // 3