Urgent Assignment assistance error message : So I'm working on an assignment, using codeblocks for c language. 
first year student, trying to solve an error message. 

user must choose between the following projectiles. 
each projectile has a blast radius and this is the code i have so far:

 userProjectileChoice = myProjectiles[3];      

myProjectiles[0].projectileName = "cannonBall";     myProjectiles[0].blastRadius  = 10;      

myProjectiles[1].projectileName = "highExplosiveShell";     myProjectiles[1].blastRadius  = 1;      

myProjectiles[2].projectileName = "mortarBomb";     
myProjectiles[2].blastRadius  = 1000;        

i need to use the struct as it is required. 
error message: incompatible types when assigning to type 'int' from type 'struct'

please help 