# Define function and use it: square : Function « Function « C / ANSI-C

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Define function and use it: square
 ``` #include  int sqr(int x); int main(void) {   int t=10;   printf("%d %d", sqr(t), t);   return 0; } int sqr(int x) {   x = x * x;   return( x ); }                       ```
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