Fixed compiler warnings in example_experiment in C.
Fixed compiler warnings in example_experiment in C.

dtusar/coco,NDManh/numbbo,dtusar/coco,NDManh/numbbo,oaelhara/numbbo,NDManh/numbbo,oaelhara/numbbo,oaelhara/numbbo,dtusar/coco,dtusar/coco,oaelhara/numbbo,dtusar/coco,NDManh/numbbo,oaelhara/numbbo,oaelhara/numbbo,NDManh/numbbo,dtusar/coco,oaelhara/numbbo,NDManh/numbbo,NDManh/numbbo,oaelhara/numbbo,NDManh/numbbo,dtusar/coco,NDManh/numbbo,dtusar/coco,dtusar/coco,oaelhara/numbbo