'Adding sum;'

gene.txt

@@ -1,3 +1,4 @@
 # gene  w
 ABC  1.0
-DED  2.0
+DED  2.0
+DAD  8.0

main.c

@@ -26,6 +26,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #define MAX_LINE_LENGTH 1000
 
 int main() {
@@ -40,13 +41,19 @@ int main() {
         exit(1);
     }
 
+    double sum = 0.0;
     while (fgets(line, MAX_LINE_LENGTH, fptr)!=NULL) {
-        printf("%s", line);
+//        printf("%s", line);
 
         char gene[MAX_LINE_LENGTH];
         double weight;
-        sscanf(line,"%s %f", gene, &weight);
+        sscanf(line,"%s %lf", gene, &weight);
 
-        printf("\nGene: %s has weight %lf\n", gene, weight);
+        if (strchr(gene, 'A') != NULL) {
+            printf("\nGene A: %s has weight %lf\n", gene, weight);
+            sum += weight;
+        }
     }
+
+    printf("Total sum for gene A is %lf\n", sum);
 }