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C Bug: Character Count

Count the number of characters only if the characters are ('A', 'T', 'C', 'G'), else 'Invalid input'. ========== Example_01 ========== Input: ATTCCGG Output: A 1 T 2 C 2 G 2 ========== Example_02 ========== Input: AKLTCG Output: Invalid input ========== I have the code above which runs for the count but does not tell whether it is an invalid case. Code: https://code.sololearn.com/ca25A24A3A9A ========== Probably, the else if statement in the function, count, went wrong. not sure... Any help, would be highly appreciated... Thanks

12th Apr 2021, 4:48 AM
Arun Bhattacharya
Arun Bhattacharya - avatar
2 Respostas
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I think your issue may have been with fgets and the that it adds the newline character to the buffer if it is read. #include <stdio.h> #include <string.h> #define MAX_SIZE_STRING 1000 // Not sure if you are only allowed caps but this version will only account for CAP 'A', 'T', 'C', and 'G' // Sticking with keeping your string at 999 characters plus the '\0' int main(void){ int count_of_ATCG[4] = { 0 }; printf("Enter string to test:\n"); char test_string[MAX_SIZE_STRING]; fgets(test_string, MAX_SIZE_STRING, stdin); /* fgets() reads in at most one less than size characters from stream and stores them into the buffer pointed to by s. Reading stops after an EOF or a newline. If a newline is read, it is stored into the buffer. A terminating null byte ('\0') is stored after the last character in the buffer. Your possible issue is that the '\n' (newline) character was being read */ for(int i = 0; i < (strlen(test_string) - 1); i++){ switch(test_string[i]){ case 'A' : count_of_ATCG[0]++; break; case 'T' : count_of_ATCG[1]++; break; case 'C' : count_of_ATCG[2]++; break; case 'G' : count_of_ATCG[3]++; break; default: printf("Invalid input\n"); return 0; } } printf("A: %i\nT: %i\nC: %i\nG: %i\n", count_of_ATCG[0], count_of_ATCG[1], count_of_ATCG[2], count_of_ATCG[3]); return 0; }
23rd Sep 2021, 11:14 PM
William Owens
William Owens - avatar
14th Sep 2021, 7:54 AM
Shubham Bhatia
Shubham Bhatia - avatar