Just saw your comment about accents and thought you and others might find this list useful if they are using a UK keyboard..
Some of them are German and Irish and the last 4 are useful as well.
If you have a laptop without a number pad on the right, they may not work with the numbers along the top. In which case you have to press Numlock (or Fn + Numlock) and then use the numbers embedded in the alpha keys, then turn off Numlock to go back to normal characters. A bit cumbersome but if you are writing something important in French it can be worthwhile.
Best regards
John Dawson
Press Alt and:
à 0224
á Ctrl + a
Á Ctrl + A
â 0226
ä 0228
Ä 0196
ç 0231
è 0232
ë 0235
é Ctrl + E
ê 0234
î 0238
í Ctrl + I
ô 0244
ö 0246
ù 0249
û 0251
ü 0252
¼ 0188
½ 0189
¾ 0190
° 0176 (degrees)
Thanks John very useful ,but impossible with this little ipad