sprintf formats a string and writes it into the character array specified by the first argument (assuming sufficient space); printf formats a string and writes it to stdout.
Ex: you can do this with sprintf:
char buffer[100];
sprintf(buffer, "My name is %s and I am %d years old", "John Doe", 25);
// buffer now contains "My name is John Doe and I am 25 years old"
However, if you want to write a formatted string to the standard output stream, you need to use printf (or fprintf with stdout as the first argument):
printf("My name is %s and I am %d years old", "John Doe", 25);
// the text "My name is John Doe and I am 25 years old" gets printed to the stdout stream
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solved What is the difference between sprintf and printf in C? [duplicate]