There are fundamentally three types of instructions in C:

1. Type Acknowledgment Instruction
2. Arithmetic Instruction
3. Control Instruction

The purpose of anniversary of these instructions is accustomed below:
1) Type acknowledgment instruction
To acknowledge the blazon of variables acclimated in a C program.
2)Arithmetic instruction
To accomplish addition operations amid con-stants & variables.
3)Control instruction
To ascendancy the arrangement of beheading of assorted state-ments in a C program.