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Do you even know what %d is for?
It's an placeholder which will insert an integer (whole) number.

Example (integer):

pawn Код:

new string[16], myVariable = 5;
format(string, sizeof(string), "myInteger: %d", myVariable);
SendClientMessage(playerid, 0xFFFFFFAA, string);

This will display "myInteger: 5".

Example (float):

pawn Код:

new string[16], Float:myVariable = 5.0;
format(string, sizeof(string), "myFloat: %f", myVariable);
SendClientMessage(playerid, 0xFFFFFFAA, string);

This will display "myFloat: 5.0".

Example (string):

pawn Код:

new string[24], myVariable[8];
format(myVariable, sizeof(myVariable), "myText");
format(string, sizeof(string), "myString: %s", myVariable);
SendClientMessage(playerid, 0xFFFFFFAA, string);

This will display "myString: MyText".

You can learn more here.