[PDF] 1 C PROGRAMMING: INTEGER DIVISION AND MODULO (%) When





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[PDF] 1 C PROGRAMMING: INTEGER DIVISION AND MODULO (%) When

C PROGRAMMING: INTEGER DIVISION AND MODULO ( ) When two integers are divided, the result is truncated That is, when the computer calculates

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C PROGRAMMING: INTEGER DIVISION AND MODULO (%)

When two integers are divided, the result is truncated. That is, when the computer calculates

23/4, instead of getting 5.75 it gets 5. The computer literally asks how many times 4 goes

into 23, and doesn"t care anything about the remainder. The modulo function (%)is very useful when doing integer arithmetic because it computes the remainder.

The following program illustrates these points.

#include #include int main(void) { int n,k,r,d; printf("Please enter n,k\n"); scanf("%i %i",&n,&k); d=n/k; r=n%k; printf("Integer division: %i divided by %i is %i\n",n,k,d); printf("The remainder when %i is divided by %i is %i\n",n,k,r); return 0; }

Comments:

[1]A fairly common bug in programs is forgetting that integer arithmetic truncates things. Thus if you have two doublesxandyand have a line of C code reading y= (1/2)?x;the result will bey= 0 because the computer will set 1/2 to zero. You can get the right answer either with y=x/2;or withy= (1./2.)?x;In the latter case the decimal points force the computer to do real number arithmetic. It is a good habit to put deimal points after all numbers that are not integers to avoid this sort of bug.

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