Answer:#include <stdio.h>
int main()
{
int ang1, ang2, ang3; /*are three angles of a triangle */
/* Read two angles of the triangle from user separated by comma*/
printf("Input two angles of triangle separated by comma : ");
scanf("%d, %d", &ang1, &ang2);
ang3 = 180 - (ang1 + ang2); /* Calculates the third angle */
printf("Third angle of the triangle : %d\\", ang3);
return 0;
}