source code migrating from gitlab

c-lang/main.c

@@ -0,0 +1,71 @@
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+unsigned int getSum(FILE *file);
+char getFirstDigit(const char *line, size_t len);
+char getLastDigit(const char *line, size_t len);
+
+int main(int argc, char *argv[]) {
+
+  if (argc != 2) {
+    printf("error: missing file input\n");
+    return 1;
+  }
+
+  FILE *file = fopen(argv[1], "r");
+  if (file == NULL) {
+    printf("could not open file: %s\n", argv[1]);
+    return 1;
+  }
+
+  unsigned int sum = getSum(file);
+  printf("%d\n", sum);
+
+  fclose(file);
+
+  return 0;
+}
+
+unsigned int getSum(FILE *file) {
+
+  unsigned int sum = 0;
+  size_t len = 0;
+  size_t read;
+  char *line = NULL;
+
+  while ((read = getline(&line, &len, file)) != -1) {
+    char first = getFirstDigit(line, read);
+    char last = getLastDigit(line, read);
+
+    char digits[3] = {first, last, '\0'};
+    sum += atoi(digits);
+  }
+
+  // free(line);
+  return sum;
+}
+
+char getFirstDigit(const char *line, size_t len) {
+
+  char digit;
+  for (int i = 0; i < len; i++) {
+    if (isdigit(line[i])) {
+      digit = (char)line[i];
+      break;
+    }
+  }
+  return digit;
+}
+
+char getLastDigit(const char *line, size_t len) {
+
+  char digit;
+  for (int i = len - 1; i >= 0; i--) {
+    if (isdigit(line[i])) {
+      digit = (char)line[i];
+      break;
+    }
+  }
+  return digit;
+}