CODEWITHSUNDEEP
cmathlong-integerinteger-overflow
Daedra
Daedra

Reputation: 17

Sum of two long long int when they give a result bigger thant long long int?

Is there a possible way to sum two different long long int variables when the result is going to be bigger than a long long int in C?

Upvotes: 1

Views: 2883

Answers (1)

chux
chux

Reputation: 153358

As OP wants to "print the result in the screen", divide the number in 2 parts: Most-Significant-Digits and Least-Significant-Digit.

#include <stdlib.h>

void print_long_long_sum(long long a, long long b) {
  if ((a < 0) == (b < 0)) {  // a and b of the same sign?
    // Sum the Most-Significatn_Digits and Least-Significant Digit separately
    int sumLSD = (int) (a % 10 + b % 10);
    long long sumMSDs = a / 10 + b / 10 + sumLSD / 10;
    sumLSD %= 10;
    printf("sum = ");
    if (sumMSDs) {
      printf("%lld", sumMSDs);
      // Since sign already printed, insure next print is positive
      sumLSD = abs(sumLSD); 
    }
    printf("%d\n", sumLSD);
  } else { // No need to separate as there is no chance for overflow
    printf("sum = %lld\n", a + b);
  }
}

Upvotes: 1

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