job interview today

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today i attend a job interview, from now on i realized that i am not family with op amplier and c language. the input resistant value of op negetive port is the value between the vin and imagine ground, as the voltage source resistance value is let the input connected with ground, then the input and ground value is the input resistance. the positive input resistance value of op is the vin connected with ground, then the resistance value is the positive port inputing resistance.so the equivalent resistance value is the input resistance value of the positive port. As the positive and negetive is contrary in sign inside the op chip, so the common resistance is big and different resistance is small c language ,the char is 1 B, int is 2 B and double 8B, float is 4B , and B is 8 bit