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  1. char* addStrings(char* num1, char* num2) {
  2.     int carry = 0, temp, off_0 = '0', len1 = strlen(num1), len2 = strlen(num2), lensum = ((len1>len2)?len1:len2) + 1;
  3.     char* sum = malloc(sizeof(char)*(lensum+1));
  4.  
  5.     sum[lensum--]='\0';
  6.     while(len1 > 0 || len2 > 0){
  7.     	len1--;
  8.     	len2--;
  9.         temp = carry;
  10.         if(len1 >= 0)
  11.         	temp += num1[len1] - off_0;
  12.         if(len2 >= 0)
  13.         	temp += num2[len2] - off_0;
  14.         carry = temp/10;
  15.         sum[lensum--] = off_0 + temp%10;
  16.     }
  17.  
  18.     if(carry > 0)
  19.     sum[lensum] = off_0 + carry;
  20.  
  21.     if(sum[0] == '\0'){
  22.        	sum[0] = sum[1];
  23.         for(int i = 1; sum[i] != '\0'; i++){
  24.             sum[i] = sum[i+1];
  25.         }
  26.     }
  27.  
  28.     return sum;
  29. }
  30.  
  31. int main(void) {
  32. 	char* s = addStrings("61480723987857250303867015585644902996295272","17149437458129895288707346085");
  33. 	printf("Sum is %s", s);
  34. 	return 0;
  35. }
  36.  
Success #stdin #stdout 0s 10320KB
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Standard input is empty
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Sum is 61480723987857267453304473715540191703641357
https://ideone.com/g2g9Wg
language:
C (gcc 8.3)
created:
7 years ago
visibility:
public

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