C Program for understanding the concept of Pre-decrement and Post-decrement
 int i=10,j;
 j = i--; //j value 10 , i value 11
 //post decrement
 printf("\n After post-decrement: j value: %d , i value:%d \n",j,i);
 j = --i; //j value 12, i value 12
 printf("\n After pre-decrement: j value: %d, i value:%d \n",j,i);
Output: ( using GNU GCC Compiler with Code Blocks IDE )
After post-decrement: j value: 10 , i value: 9
After pre-decrement: j value: 8, i value: 8

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