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#include <stdio.h> int numLen(int x) // returns the number of digits in x { int len = 0; while (x > 0) { x = x / 10; len++; } return len; } void patternChecks(int x, float* product, int* divisor_p) /* returns the product of all digits in x divided by the last digit in x (via *product). checks if the first digit is divisible by the last digit and returns 1 if true, 0 otherwise (via *divisor_p). */ { int first = x/1000; int last = x%10; int num = x; *product = 1; while (x > 0) { *product = *product * (x % 10); x = x / 10; } *product = *product / last; if ( last % first == 0) { *divisor_p = 1; } else { *divisor_p = 0; } } int main() { int x; float product = 1; int divisor_p; printf("Enter a 4-digit number: "); scanf("%d", &x); int len = numLen(x); while (len != 4) { printf("This number is %d digits\n", len); printf("Enter a 4-digit number: "); scanf("%d", &x); len = numLen(x); } patternChecks(x, &product, &divisor_p); if (divisor_p == 1) { printf("The product of digits in %d divided by %d is %.1f and the right most digit of %d is divisible by the left most digit\n", x, x % 10, product, x); } else { printf("The product of digits in %d divided by %d is %.1f and the right most digit of %d is not divisible by the left most digit\n", x, x % 10, product, x); } return 0; }

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