C PROGRAMMING LANGUAGE

why is it telling me this and how do I get passed this error? please?

Payments\t $ %.21f", fees + 0); 50 51 52 53 } break; case 1: ./main QX Here is a list of all courses offered at Vale nce Community College: CRN Course Prefix CREDIT HOURS 4587 MAT 236 4599 COP 220 8997 GOL 124 1 9696 COP 100 3 54 4 3 55 wew 56 57 58 printf(" Enter the course qumber: "); scanf(" bsd", crna): if (crn1>0) a { printf(" Sorry invalid entty! "); printf("\t\t\t\t\t Try again. Goodbye! "); } 59 Enter the student ID: 5656 Enter how many courses taken (up to 2): 1 60 61 62 63 64 65 Enter the course number: 4587 signal: segmentation fault (core dumped) 66 67 } break; case 2: { printf("Enter the 2 courses numbers separated by . :(like 2356 8954) "); scanf("%d-%d", crni, crn2); printf("Thank you !"); 68 69