Grade Generation or use of else-if statement in C

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#include<stdio.h> //preprocessor , header library file included. main() //main funtion starts. { int marks; //variable taken defining datatype printf("Enter your obtained marks:\t"); //a message to the user regarding the program scanf("%d",&marks); //input taken from user. if(marks<=100){ //if starts from here with a condition if(marks>=80 && marks<=100) printf("A+\n"); //else ....if ladder starts from here. else if(marks>=70 && marks<=79) printf("A-\n"); else if(marks>=60 && marks<=69) printf("B+\n"); else if(marks>=50 && marks<=59) printf("C+\n"); else if(marks>=45 && marks<=49) printf("D\n"); else if(marks>=0 && marks<=40) printf("F\n"); //else if ladder ends here. } else printf("Sorry the inputed marks is greater than 100.\n"); //the default message printed. } //program ends here.